diff --git a/discoveryengine/apiv1alpha/discoveryenginepb/chunk.pb.go b/discoveryengine/apiv1alpha/discoveryenginepb/chunk.pb.go
index bcca65800b23..209fbb33b658 100755
--- a/discoveryengine/apiv1alpha/discoveryenginepb/chunk.pb.go
+++ b/discoveryengine/apiv1alpha/discoveryenginepb/chunk.pb.go
@@ -51,7 +51,7 @@ type Chunk struct {
 	// This field must be a UTF-8 encoded string with a length limit of 1024
 	// characters.
 	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	// Unique chunk id of the current chunk.
+	// Unique chunk ID of the current chunk.
 	Id string `protobuf:"bytes,2,opt,name=id,proto3" json:"id,omitempty"`
 	// Content is a string from a document (parsed content).
 	Content string `protobuf:"bytes,3,opt,name=content,proto3" json:"content,omitempty"`
@@ -60,6 +60,10 @@ type Chunk struct {
 	// Output only. This field is OUTPUT_ONLY.
 	// It contains derived data that are not in the original input document.
 	DerivedStructData *structpb.Struct `protobuf:"bytes,4,opt,name=derived_struct_data,json=derivedStructData,proto3" json:"derived_struct_data,omitempty"`
+	// Page span of the chunk.
+	PageSpan *Chunk_PageSpan `protobuf:"bytes,6,opt,name=page_span,json=pageSpan,proto3" json:"page_span,omitempty"`
+	// Output only. Metadata of the current chunk.
+	ChunkMetadata *Chunk_ChunkMetadata `protobuf:"bytes,7,opt,name=chunk_metadata,json=chunkMetadata,proto3" json:"chunk_metadata,omitempty"`
 }
 
 func (x *Chunk) Reset() {
@@ -129,6 +133,20 @@ func (x *Chunk) GetDerivedStructData() *structpb.Struct {
 	return nil
 }
 
+func (x *Chunk) GetPageSpan() *Chunk_PageSpan {
+	if x != nil {
+		return x.PageSpan
+	}
+	return nil
+}
+
+func (x *Chunk) GetChunkMetadata() *Chunk_ChunkMetadata {
+	if x != nil {
+		return x.ChunkMetadata
+	}
+	return nil
+}
+
 // Document metadata contains the information of the document of the current
 // chunk.
 type Chunk_DocumentMetadata struct {
@@ -188,6 +206,132 @@ func (x *Chunk_DocumentMetadata) GetTitle() string {
 	return ""
 }
 
+// Page span of the chunk.
+type Chunk_PageSpan struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The start page of the chunk.
+	PageStart int32 `protobuf:"varint,1,opt,name=page_start,json=pageStart,proto3" json:"page_start,omitempty"`
+	// The end page of the chunk.
+	PageEnd int32 `protobuf:"varint,2,opt,name=page_end,json=pageEnd,proto3" json:"page_end,omitempty"`
+}
+
+func (x *Chunk_PageSpan) Reset() {
+	*x = Chunk_PageSpan{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_chunk_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Chunk_PageSpan) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Chunk_PageSpan) ProtoMessage() {}
+
+func (x *Chunk_PageSpan) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_chunk_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Chunk_PageSpan.ProtoReflect.Descriptor instead.
+func (*Chunk_PageSpan) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_chunk_proto_rawDescGZIP(), []int{0, 1}
+}
+
+func (x *Chunk_PageSpan) GetPageStart() int32 {
+	if x != nil {
+		return x.PageStart
+	}
+	return 0
+}
+
+func (x *Chunk_PageSpan) GetPageEnd() int32 {
+	if x != nil {
+		return x.PageEnd
+	}
+	return 0
+}
+
+// Metadata of the current chunk. This field is only populated on
+// [SearchService.Search][google.cloud.discoveryengine.v1alpha.SearchService.Search]
+// API.
+type Chunk_ChunkMetadata struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The previous chunks of the current chunk. The number is controlled by
+	// [SearchRequest.ContentSearchSpec.ChunkSpec.num_previous_chunks][google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.ChunkSpec.num_previous_chunks].
+	// This field is only populated on
+	// [SearchService.Search][google.cloud.discoveryengine.v1alpha.SearchService.Search]
+	// API.
+	PreviousChunks []*Chunk `protobuf:"bytes,1,rep,name=previous_chunks,json=previousChunks,proto3" json:"previous_chunks,omitempty"`
+	// The next chunks of the current chunk. The number is controlled by
+	// [SearchRequest.ContentSearchSpec.ChunkSpec.num_next_chunks][google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.ChunkSpec.num_next_chunks].
+	// This field is only populated on
+	// [SearchService.Search][google.cloud.discoveryengine.v1alpha.SearchService.Search]
+	// API.
+	NextChunks []*Chunk `protobuf:"bytes,2,rep,name=next_chunks,json=nextChunks,proto3" json:"next_chunks,omitempty"`
+}
+
+func (x *Chunk_ChunkMetadata) Reset() {
+	*x = Chunk_ChunkMetadata{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_chunk_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Chunk_ChunkMetadata) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Chunk_ChunkMetadata) ProtoMessage() {}
+
+func (x *Chunk_ChunkMetadata) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_chunk_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Chunk_ChunkMetadata.ProtoReflect.Descriptor instead.
+func (*Chunk_ChunkMetadata) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_chunk_proto_rawDescGZIP(), []int{0, 2}
+}
+
+func (x *Chunk_ChunkMetadata) GetPreviousChunks() []*Chunk {
+	if x != nil {
+		return x.PreviousChunks
+	}
+	return nil
+}
+
+func (x *Chunk_ChunkMetadata) GetNextChunks() []*Chunk {
+	if x != nil {
+		return x.NextChunks
+	}
+	return nil
+}
+
 var File_google_cloud_discoveryengine_v1alpha_chunk_proto protoreflect.FileDescriptor
 
 var file_google_cloud_discoveryengine_v1alpha_chunk_proto_rawDesc = []byte{
@@ -202,7 +346,7 @@ var file_google_cloud_discoveryengine_v1alpha_chunk_proto_rawDesc = []byte{
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 }
 
 var (
@@ -274,20 +445,26 @@ func file_google_cloud_discoveryengine_v1alpha_chunk_proto_rawDescGZIP() []byte
 	return file_google_cloud_discoveryengine_v1alpha_chunk_proto_rawDescData
 }
 
-var file_google_cloud_discoveryengine_v1alpha_chunk_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_google_cloud_discoveryengine_v1alpha_chunk_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
 var file_google_cloud_discoveryengine_v1alpha_chunk_proto_goTypes = []interface{}{
 	(*Chunk)(nil),                  // 0: google.cloud.discoveryengine.v1alpha.Chunk
 	(*Chunk_DocumentMetadata)(nil), // 1: google.cloud.discoveryengine.v1alpha.Chunk.DocumentMetadata
-	(*structpb.Struct)(nil),        // 2: google.protobuf.Struct
+	(*Chunk_PageSpan)(nil),         // 2: google.cloud.discoveryengine.v1alpha.Chunk.PageSpan
+	(*Chunk_ChunkMetadata)(nil),    // 3: google.cloud.discoveryengine.v1alpha.Chunk.ChunkMetadata
+	(*structpb.Struct)(nil),        // 4: google.protobuf.Struct
 }
 var file_google_cloud_discoveryengine_v1alpha_chunk_proto_depIdxs = []int32{
 	1, // 0: google.cloud.discoveryengine.v1alpha.Chunk.document_metadata:type_name -> google.cloud.discoveryengine.v1alpha.Chunk.DocumentMetadata
-	2, // 1: google.cloud.discoveryengine.v1alpha.Chunk.derived_struct_data:type_name -> google.protobuf.Struct
-	2, // [2:2] is the sub-list for method output_type
-	2, // [2:2] is the sub-list for method input_type
-	2, // [2:2] is the sub-list for extension type_name
-	2, // [2:2] is the sub-list for extension extendee
-	0, // [0:2] is the sub-list for field type_name
+	4, // 1: google.cloud.discoveryengine.v1alpha.Chunk.derived_struct_data:type_name -> google.protobuf.Struct
+	2, // 2: google.cloud.discoveryengine.v1alpha.Chunk.page_span:type_name -> google.cloud.discoveryengine.v1alpha.Chunk.PageSpan
+	3, // 3: google.cloud.discoveryengine.v1alpha.Chunk.chunk_metadata:type_name -> google.cloud.discoveryengine.v1alpha.Chunk.ChunkMetadata
+	0, // 4: google.cloud.discoveryengine.v1alpha.Chunk.ChunkMetadata.previous_chunks:type_name -> google.cloud.discoveryengine.v1alpha.Chunk
+	0, // 5: google.cloud.discoveryengine.v1alpha.Chunk.ChunkMetadata.next_chunks:type_name -> google.cloud.discoveryengine.v1alpha.Chunk
+	6, // [6:6] is the sub-list for method output_type
+	6, // [6:6] is the sub-list for method input_type
+	6, // [6:6] is the sub-list for extension type_name
+	6, // [6:6] is the sub-list for extension extendee
+	0, // [0:6] is the sub-list for field type_name
 }
 
 func init() { file_google_cloud_discoveryengine_v1alpha_chunk_proto_init() }
@@ -320,6 +497,30 @@ func file_google_cloud_discoveryengine_v1alpha_chunk_proto_init() {
 				return nil
 			}
 		}
+		file_google_cloud_discoveryengine_v1alpha_chunk_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Chunk_PageSpan); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_chunk_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Chunk_ChunkMetadata); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -327,7 +528,7 @@ func file_google_cloud_discoveryengine_v1alpha_chunk_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_cloud_discoveryengine_v1alpha_chunk_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   2,
+			NumMessages:   4,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/discoveryengine/apiv1alpha/discoveryenginepb/common.pb.go b/discoveryengine/apiv1alpha/discoveryenginepb/common.pb.go
index bd50185d289e..332f009d953c 100755
--- a/discoveryengine/apiv1alpha/discoveryenginepb/common.pb.go
+++ b/discoveryengine/apiv1alpha/discoveryenginepb/common.pb.go
@@ -48,6 +48,8 @@ const (
 	IndustryVertical_GENERIC IndustryVertical = 1
 	// The media industry vertical.
 	IndustryVertical_MEDIA IndustryVertical = 2
+	// The healthcare FHIR vertical.
+	IndustryVertical_HEALTHCARE_FHIR IndustryVertical = 7
 )
 
 // Enum value maps for IndustryVertical.
@@ -56,11 +58,13 @@ var (
 		0: "INDUSTRY_VERTICAL_UNSPECIFIED",
 		1: "GENERIC",
 		2: "MEDIA",
+		7: "HEALTHCARE_FHIR",
 	}
 	IndustryVertical_value = map[string]int32{
 		"INDUSTRY_VERTICAL_UNSPECIFIED": 0,
 		"GENERIC":                       1,
 		"MEDIA":                         2,
+		"HEALTHCARE_FHIR":               7,
 	}
 )
 
@@ -103,6 +107,10 @@ const (
 	SolutionType_SOLUTION_TYPE_SEARCH SolutionType = 2
 	// Used for use cases related to the Generative AI agent.
 	SolutionType_SOLUTION_TYPE_CHAT SolutionType = 3
+	// Used for use cases related to the Generative Chat agent.
+	// It's used for Generative chat engine only, the associated data stores
+	// must enrolled with `SOLUTION_TYPE_CHAT` solution.
+	SolutionType_SOLUTION_TYPE_GENERATIVE_CHAT SolutionType = 4
 )
 
 // Enum value maps for SolutionType.
@@ -112,12 +120,14 @@ var (
 		1: "SOLUTION_TYPE_RECOMMENDATION",
 		2: "SOLUTION_TYPE_SEARCH",
 		3: "SOLUTION_TYPE_CHAT",
+		4: "SOLUTION_TYPE_GENERATIVE_CHAT",
 	}
 	SolutionType_value = map[string]int32{
-		"SOLUTION_TYPE_UNSPECIFIED":    0,
-		"SOLUTION_TYPE_RECOMMENDATION": 1,
-		"SOLUTION_TYPE_SEARCH":         2,
-		"SOLUTION_TYPE_CHAT":           3,
+		"SOLUTION_TYPE_UNSPECIFIED":     0,
+		"SOLUTION_TYPE_RECOMMENDATION":  1,
+		"SOLUTION_TYPE_SEARCH":          2,
+		"SOLUTION_TYPE_CHAT":            3,
+		"SOLUTION_TYPE_GENERATIVE_CHAT": 4,
 	}
 )
 
@@ -1096,75 +1106,102 @@ var file_google_cloud_discoveryengine_v1alpha_common_proto_rawDesc = []byte{
 	0x06, 0x75, 0x73, 0x65, 0x72, 0x49, 0x64, 0x12, 0x1b, 0x0a, 0x08, 0x67, 0x72, 0x6f, 0x75, 0x70,
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+	0x6e, 0x67, 0x69, 0x6e, 0x65, 0x70, 0x62, 0xa2, 0x02, 0x0f, 0x44, 0x49, 0x53, 0x43, 0x4f, 0x56,
+	0x45, 0x52, 0x59, 0x45, 0x4e, 0x47, 0x49, 0x4e, 0x45, 0xaa, 0x02, 0x24, 0x47, 0x6f, 0x6f, 0x67,
+	0x6c, 0x65, 0x2e, 0x43, 0x6c, 0x6f, 0x75, 0x64, 0x2e, 0x44, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65,
+	0x72, 0x79, 0x45, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x2e, 0x56, 0x31, 0x41, 0x6c, 0x70, 0x68, 0x61,
+	0xca, 0x02, 0x24, 0x47, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x5c, 0x43, 0x6c, 0x6f, 0x75, 0x64, 0x5c,
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+	0x3a, 0x3a, 0x43, 0x6c, 0x6f, 0x75, 0x64, 0x3a, 0x3a, 0x44, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65,
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+	0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/discoveryengine/apiv1alpha/discoveryenginepb/document.pb.go b/discoveryengine/apiv1alpha/discoveryenginepb/document.pb.go
index f2cbc146d0e3..269cef9b08af 100755
--- a/discoveryengine/apiv1alpha/discoveryenginepb/document.pb.go
+++ b/discoveryengine/apiv1alpha/discoveryenginepb/document.pb.go
@@ -223,6 +223,88 @@ func (*Document_StructData) isDocument_Data() {}
 
 func (*Document_JsonData) isDocument_Data() {}
 
+// Document captures all raw metadata information of items to be recommended or
+// searched.
+type ProcessedDocument struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Output format of the processed document.
+	//
+	// Types that are assignable to ProcessedDataFormat:
+	//
+	//	*ProcessedDocument_JsonData
+	ProcessedDataFormat isProcessedDocument_ProcessedDataFormat `protobuf_oneof:"processed_data_format"`
+	// Required. Full resource name of the referenced document, in the format
+	// `projects/*/locations/*/collections/*/dataStores/*/branches/*/documents/*`.
+	Document string `protobuf:"bytes,1,opt,name=document,proto3" json:"document,omitempty"`
+}
+
+func (x *ProcessedDocument) Reset() {
+	*x = ProcessedDocument{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ProcessedDocument) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ProcessedDocument) ProtoMessage() {}
+
+func (x *ProcessedDocument) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ProcessedDocument.ProtoReflect.Descriptor instead.
+func (*ProcessedDocument) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_document_proto_rawDescGZIP(), []int{1}
+}
+
+func (m *ProcessedDocument) GetProcessedDataFormat() isProcessedDocument_ProcessedDataFormat {
+	if m != nil {
+		return m.ProcessedDataFormat
+	}
+	return nil
+}
+
+func (x *ProcessedDocument) GetJsonData() string {
+	if x, ok := x.GetProcessedDataFormat().(*ProcessedDocument_JsonData); ok {
+		return x.JsonData
+	}
+	return ""
+}
+
+func (x *ProcessedDocument) GetDocument() string {
+	if x != nil {
+		return x.Document
+	}
+	return ""
+}
+
+type isProcessedDocument_ProcessedDataFormat interface {
+	isProcessedDocument_ProcessedDataFormat()
+}
+
+type ProcessedDocument_JsonData struct {
+	// The JSON string representation of the processed document.
+	JsonData string `protobuf:"bytes,2,opt,name=json_data,json=jsonData,proto3,oneof"`
+}
+
+func (*ProcessedDocument_JsonData) isProcessedDocument_ProcessedDataFormat() {}
+
 // Unstructured data linked to this document.
 type Document_Content struct {
 	state         protoimpl.MessageState
@@ -249,7 +331,7 @@ type Document_Content struct {
 func (x *Document_Content) Reset() {
 	*x = Document_Content{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[1]
+		mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -262,7 +344,7 @@ func (x *Document_Content) String() string {
 func (*Document_Content) ProtoMessage() {}
 
 func (x *Document_Content) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[1]
+	mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -346,7 +428,7 @@ type Document_AclInfo struct {
 func (x *Document_AclInfo) Reset() {
 	*x = Document_AclInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[2]
+		mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -359,7 +441,7 @@ func (x *Document_AclInfo) String() string {
 func (*Document_AclInfo) ProtoMessage() {}
 
 func (x *Document_AclInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[2]
+	mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -456,7 +538,7 @@ type Document_AclInfo_AccessRestriction struct {
 func (x *Document_AclInfo_AccessRestriction) Reset() {
 	*x = Document_AclInfo_AccessRestriction{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[3]
+		mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -469,7 +551,7 @@ func (x *Document_AclInfo_AccessRestriction) String() string {
 func (*Document_AclInfo_AccessRestriction) ProtoMessage() {}
 
 func (x *Document_AclInfo_AccessRestriction) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[3]
+	mi := &file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -582,25 +664,35 @@ var file_google_cloud_discoveryengine_v1alpha_document_proto_rawDesc = []byte{
 	0x64, 0x61, 0x74, 0x61, 0x5f, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x7d, 0x2f, 0x62, 0x72, 0x61, 0x6e,
 	0x63, 0x68, 0x65, 0x73, 0x2f, 0x7b, 0x62, 0x72, 0x61, 0x6e, 0x63, 0x68, 0x7d, 0x2f, 0x64, 0x6f,
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+	0x3a, 0x3a, 0x43, 0x6c, 0x6f, 0x75, 0x64, 0x3a, 0x3a, 0x44, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65,
+	0x72, 0x79, 0x45, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x3a, 0x3a, 0x56, 0x31, 0x61, 0x6c, 0x70, 0x68,
+	0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -615,24 +707,25 @@ func file_google_cloud_discoveryengine_v1alpha_document_proto_rawDescGZIP() []by
 	return file_google_cloud_discoveryengine_v1alpha_document_proto_rawDescData
 }
 
-var file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
 var file_google_cloud_discoveryengine_v1alpha_document_proto_goTypes = []interface{}{
 	(*Document)(nil),                           // 0: google.cloud.discoveryengine.v1alpha.Document
-	(*Document_Content)(nil),                   // 1: google.cloud.discoveryengine.v1alpha.Document.Content
-	(*Document_AclInfo)(nil),                   // 2: google.cloud.discoveryengine.v1alpha.Document.AclInfo
-	(*Document_AclInfo_AccessRestriction)(nil), // 3: google.cloud.discoveryengine.v1alpha.Document.AclInfo.AccessRestriction
-	(*structpb.Struct)(nil),                    // 4: google.protobuf.Struct
-	(*timestamppb.Timestamp)(nil),              // 5: google.protobuf.Timestamp
-	(*Principal)(nil),                          // 6: google.cloud.discoveryengine.v1alpha.Principal
+	(*ProcessedDocument)(nil),                  // 1: google.cloud.discoveryengine.v1alpha.ProcessedDocument
+	(*Document_Content)(nil),                   // 2: google.cloud.discoveryengine.v1alpha.Document.Content
+	(*Document_AclInfo)(nil),                   // 3: google.cloud.discoveryengine.v1alpha.Document.AclInfo
+	(*Document_AclInfo_AccessRestriction)(nil), // 4: google.cloud.discoveryengine.v1alpha.Document.AclInfo.AccessRestriction
+	(*structpb.Struct)(nil),                    // 5: google.protobuf.Struct
+	(*timestamppb.Timestamp)(nil),              // 6: google.protobuf.Timestamp
+	(*Principal)(nil),                          // 7: google.cloud.discoveryengine.v1alpha.Principal
 }
 var file_google_cloud_discoveryengine_v1alpha_document_proto_depIdxs = []int32{
-	4, // 0: google.cloud.discoveryengine.v1alpha.Document.struct_data:type_name -> google.protobuf.Struct
-	1, // 1: google.cloud.discoveryengine.v1alpha.Document.content:type_name -> google.cloud.discoveryengine.v1alpha.Document.Content
-	4, // 2: google.cloud.discoveryengine.v1alpha.Document.derived_struct_data:type_name -> google.protobuf.Struct
-	2, // 3: google.cloud.discoveryengine.v1alpha.Document.acl_info:type_name -> google.cloud.discoveryengine.v1alpha.Document.AclInfo
-	5, // 4: google.cloud.discoveryengine.v1alpha.Document.index_time:type_name -> google.protobuf.Timestamp
-	3, // 5: google.cloud.discoveryengine.v1alpha.Document.AclInfo.readers:type_name -> google.cloud.discoveryengine.v1alpha.Document.AclInfo.AccessRestriction
-	6, // 6: google.cloud.discoveryengine.v1alpha.Document.AclInfo.AccessRestriction.principals:type_name -> google.cloud.discoveryengine.v1alpha.Principal
+	5, // 0: google.cloud.discoveryengine.v1alpha.Document.struct_data:type_name -> google.protobuf.Struct
+	2, // 1: google.cloud.discoveryengine.v1alpha.Document.content:type_name -> google.cloud.discoveryengine.v1alpha.Document.Content
+	5, // 2: google.cloud.discoveryengine.v1alpha.Document.derived_struct_data:type_name -> google.protobuf.Struct
+	3, // 3: google.cloud.discoveryengine.v1alpha.Document.acl_info:type_name -> google.cloud.discoveryengine.v1alpha.Document.AclInfo
+	6, // 4: google.cloud.discoveryengine.v1alpha.Document.index_time:type_name -> google.protobuf.Timestamp
+	4, // 5: google.cloud.discoveryengine.v1alpha.Document.AclInfo.readers:type_name -> google.cloud.discoveryengine.v1alpha.Document.AclInfo.AccessRestriction
+	7, // 6: google.cloud.discoveryengine.v1alpha.Document.AclInfo.AccessRestriction.principals:type_name -> google.cloud.discoveryengine.v1alpha.Principal
 	7, // [7:7] is the sub-list for method output_type
 	7, // [7:7] is the sub-list for method input_type
 	7, // [7:7] is the sub-list for extension type_name
@@ -660,7 +753,7 @@ func file_google_cloud_discoveryengine_v1alpha_document_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Document_Content); i {
+			switch v := v.(*ProcessedDocument); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -672,7 +765,7 @@ func file_google_cloud_discoveryengine_v1alpha_document_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Document_AclInfo); i {
+			switch v := v.(*Document_Content); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -684,6 +777,18 @@ func file_google_cloud_discoveryengine_v1alpha_document_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Document_AclInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Document_AclInfo_AccessRestriction); i {
 			case 0:
 				return &v.state
@@ -701,6 +806,9 @@ func file_google_cloud_discoveryengine_v1alpha_document_proto_init() {
 		(*Document_JsonData)(nil),
 	}
 	file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[1].OneofWrappers = []interface{}{
+		(*ProcessedDocument_JsonData)(nil),
+	}
+	file_google_cloud_discoveryengine_v1alpha_document_proto_msgTypes[2].OneofWrappers = []interface{}{
 		(*Document_Content_RawBytes)(nil),
 		(*Document_Content_Uri)(nil),
 	}
@@ -710,7 +818,7 @@ func file_google_cloud_discoveryengine_v1alpha_document_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_cloud_discoveryengine_v1alpha_document_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   4,
+			NumMessages:   5,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/discoveryengine/apiv1alpha/discoveryenginepb/document_service.pb.go b/discoveryengine/apiv1alpha/discoveryenginepb/document_service.pb.go
index 4f35d89c2619..6b5770a3d6fd 100755
--- a/discoveryengine/apiv1alpha/discoveryenginepb/document_service.pb.go
+++ b/discoveryengine/apiv1alpha/discoveryenginepb/document_service.pb.go
@@ -43,6 +43,109 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+// The type of processing to return in the response.
+type GetProcessedDocumentRequest_ProcessedDocumentType int32
+
+const (
+	// Default value.
+	GetProcessedDocumentRequest_PROCESSED_DOCUMENT_TYPE_UNSPECIFIED GetProcessedDocumentRequest_ProcessedDocumentType = 0
+	// Available for all data store parsing configs.
+	GetProcessedDocumentRequest_PARSED_DOCUMENT GetProcessedDocumentRequest_ProcessedDocumentType = 1
+	// Only available if ChunkingConfig is enabeld on the data store.
+	GetProcessedDocumentRequest_CHUNKED_DOCUMENT GetProcessedDocumentRequest_ProcessedDocumentType = 2
+)
+
+// Enum value maps for GetProcessedDocumentRequest_ProcessedDocumentType.
+var (
+	GetProcessedDocumentRequest_ProcessedDocumentType_name = map[int32]string{
+		0: "PROCESSED_DOCUMENT_TYPE_UNSPECIFIED",
+		1: "PARSED_DOCUMENT",
+		2: "CHUNKED_DOCUMENT",
+	}
+	GetProcessedDocumentRequest_ProcessedDocumentType_value = map[string]int32{
+		"PROCESSED_DOCUMENT_TYPE_UNSPECIFIED": 0,
+		"PARSED_DOCUMENT":                     1,
+		"CHUNKED_DOCUMENT":                    2,
+	}
+)
+
+func (x GetProcessedDocumentRequest_ProcessedDocumentType) Enum() *GetProcessedDocumentRequest_ProcessedDocumentType {
+	p := new(GetProcessedDocumentRequest_ProcessedDocumentType)
+	*p = x
+	return p
+}
+
+func (x GetProcessedDocumentRequest_ProcessedDocumentType) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (GetProcessedDocumentRequest_ProcessedDocumentType) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_cloud_discoveryengine_v1alpha_document_service_proto_enumTypes[0].Descriptor()
+}
+
+func (GetProcessedDocumentRequest_ProcessedDocumentType) Type() protoreflect.EnumType {
+	return &file_google_cloud_discoveryengine_v1alpha_document_service_proto_enumTypes[0]
+}
+
+func (x GetProcessedDocumentRequest_ProcessedDocumentType) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use GetProcessedDocumentRequest_ProcessedDocumentType.Descriptor instead.
+func (GetProcessedDocumentRequest_ProcessedDocumentType) EnumDescriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_document_service_proto_rawDescGZIP(), []int{6, 0}
+}
+
+// The format of the returned processed document. If unspecified, defaults to
+// JSON.
+type GetProcessedDocumentRequest_ProcessedDocumentFormat int32
+
+const (
+	// Default value.
+	GetProcessedDocumentRequest_PROCESSED_DOCUMENT_FORMAT_UNSPECIFIED GetProcessedDocumentRequest_ProcessedDocumentFormat = 0
+	// output format will be a JSON string representation of processed document.
+	GetProcessedDocumentRequest_JSON GetProcessedDocumentRequest_ProcessedDocumentFormat = 1
+)
+
+// Enum value maps for GetProcessedDocumentRequest_ProcessedDocumentFormat.
+var (
+	GetProcessedDocumentRequest_ProcessedDocumentFormat_name = map[int32]string{
+		0: "PROCESSED_DOCUMENT_FORMAT_UNSPECIFIED",
+		1: "JSON",
+	}
+	GetProcessedDocumentRequest_ProcessedDocumentFormat_value = map[string]int32{
+		"PROCESSED_DOCUMENT_FORMAT_UNSPECIFIED": 0,
+		"JSON":                                  1,
+	}
+)
+
+func (x GetProcessedDocumentRequest_ProcessedDocumentFormat) Enum() *GetProcessedDocumentRequest_ProcessedDocumentFormat {
+	p := new(GetProcessedDocumentRequest_ProcessedDocumentFormat)
+	*p = x
+	return p
+}
+
+func (x GetProcessedDocumentRequest_ProcessedDocumentFormat) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (GetProcessedDocumentRequest_ProcessedDocumentFormat) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_cloud_discoveryengine_v1alpha_document_service_proto_enumTypes[1].Descriptor()
+}
+
+func (GetProcessedDocumentRequest_ProcessedDocumentFormat) Type() protoreflect.EnumType {
+	return &file_google_cloud_discoveryengine_v1alpha_document_service_proto_enumTypes[1]
+}
+
+func (x GetProcessedDocumentRequest_ProcessedDocumentFormat) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use GetProcessedDocumentRequest_ProcessedDocumentFormat.Descriptor instead.
+func (GetProcessedDocumentRequest_ProcessedDocumentFormat) EnumDescriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_document_service_proto_rawDescGZIP(), []int{6, 1}
+}
+
 // Request message for
 // [DocumentService.GetDocument][google.cloud.discoveryengine.v1alpha.DocumentService.GetDocument]
 // method.
@@ -486,6 +589,84 @@ func (x *DeleteDocumentRequest) GetName() string {
 	return ""
 }
 
+// Request message for
+// [DocumentService.GetDocument][google.cloud.discoveryengine.v1alpha.DocumentService.GetDocument]
+// method.
+type GetProcessedDocumentRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Required. Full resource name of
+	// [Document][google.cloud.discoveryengine.v1alpha.Document], such as
+	// `projects/{project}/locations/{location}/collections/{collection}/dataStores/{data_store}/branches/{branch}/documents/{document}`.
+	//
+	// If the caller does not have permission to access the
+	// [Document][google.cloud.discoveryengine.v1alpha.Document], regardless of
+	// whether or not it exists, a `PERMISSION_DENIED` error is returned.
+	//
+	// If the requested [Document][google.cloud.discoveryengine.v1alpha.Document]
+	// does not exist, a `NOT_FOUND` error is returned.
+	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	// Required. What type of processing to return.
+	ProcessedDocumentType GetProcessedDocumentRequest_ProcessedDocumentType `protobuf:"varint,2,opt,name=processed_document_type,json=processedDocumentType,proto3,enum=google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest_ProcessedDocumentType" json:"processed_document_type,omitempty"`
+	// What format output should be.  If unspecified, defaults to JSON.
+	ProcessedDocumentFormat GetProcessedDocumentRequest_ProcessedDocumentFormat `protobuf:"varint,3,opt,name=processed_document_format,json=processedDocumentFormat,proto3,enum=google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest_ProcessedDocumentFormat" json:"processed_document_format,omitempty"`
+}
+
+func (x *GetProcessedDocumentRequest) Reset() {
+	*x = GetProcessedDocumentRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_document_service_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetProcessedDocumentRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetProcessedDocumentRequest) ProtoMessage() {}
+
+func (x *GetProcessedDocumentRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_document_service_proto_msgTypes[6]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use GetProcessedDocumentRequest.ProtoReflect.Descriptor instead.
+func (*GetProcessedDocumentRequest) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_document_service_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *GetProcessedDocumentRequest) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
+func (x *GetProcessedDocumentRequest) GetProcessedDocumentType() GetProcessedDocumentRequest_ProcessedDocumentType {
+	if x != nil {
+		return x.ProcessedDocumentType
+	}
+	return GetProcessedDocumentRequest_PROCESSED_DOCUMENT_TYPE_UNSPECIFIED
+}
+
+func (x *GetProcessedDocumentRequest) GetProcessedDocumentFormat() GetProcessedDocumentRequest_ProcessedDocumentFormat {
+	if x != nil {
+		return x.ProcessedDocumentFormat
+	}
+	return GetProcessedDocumentRequest_PROCESSED_DOCUMENT_FORMAT_UNSPECIFIED
+}
+
 var File_google_cloud_discoveryengine_v1alpha_document_service_proto protoreflect.FileDescriptor
 
 var file_google_cloud_discoveryengine_v1alpha_document_service_proto_rawDesc = []byte{
@@ -575,190 +756,250 @@ var file_google_cloud_discoveryengine_v1alpha_document_service_proto_rawDesc = [
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+	0x2a, 0x2f, 0x64, 0x61, 0x74, 0x61, 0x53, 0x74, 0x6f, 0x72, 0x65, 0x73, 0x2f, 0x2a, 0x2f, 0x62,
+	0x72, 0x61, 0x6e, 0x63, 0x68, 0x65, 0x73, 0x2f, 0x2a, 0x2f, 0x64, 0x6f, 0x63, 0x75, 0x6d, 0x65,
+	0x6e, 0x74, 0x73, 0x2f, 0x2a, 0x7d, 0x3a, 0x67, 0x65, 0x74, 0x50, 0x72, 0x6f, 0x63, 0x65, 0x73,
+	0x73, 0x65, 0x64, 0x44, 0x6f, 0x63, 0x75, 0x6d, 0x65, 0x6e, 0x74, 0x12, 0x5f, 0x2f, 0x76, 0x31,
+	0x61, 0x6c, 0x70, 0x68, 0x61, 0x2f, 0x7b, 0x6e, 0x61, 0x6d, 0x65, 0x3d, 0x70, 0x72, 0x6f, 0x6a,
+	0x65, 0x63, 0x74, 0x73, 0x2f, 0x2a, 0x2f, 0x6c, 0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73,
+	0x2f, 0x2a, 0x2f, 0x64, 0x61, 0x74, 0x61, 0x53, 0x74, 0x6f, 0x72, 0x65, 0x73, 0x2f, 0x2a, 0x2f,
+	0x62, 0x72, 0x61, 0x6e, 0x63, 0x68, 0x65, 0x73, 0x2f, 0x2a, 0x2f, 0x64, 0x6f, 0x63, 0x75, 0x6d,
+	0x65, 0x6e, 0x74, 0x73, 0x2f, 0x2a, 0x7d, 0x3a, 0x67, 0x65, 0x74, 0x50, 0x72, 0x6f, 0x63, 0x65,
+	0x73, 0x73, 0x65, 0x64, 0x44, 0x6f, 0x63, 0x75, 0x6d, 0x65, 0x6e, 0x74, 0x1a, 0x52, 0xca, 0x41,
+	0x1e, 0x64, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65, 0x72, 0x79, 0x65, 0x6e, 0x67, 0x69, 0x6e, 0x65,
+	0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x61, 0x70, 0x69, 0x73, 0x2e, 0x63, 0x6f, 0x6d, 0xd2,
+	0x41, 0x2e, 0x68, 0x74, 0x74, 0x70, 0x73, 0x3a, 0x2f, 0x2f, 0x77, 0x77, 0x77, 0x2e, 0x67, 0x6f,
+	0x6f, 0x67, 0x6c, 0x65, 0x61, 0x70, 0x69, 0x73, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x61, 0x75, 0x74,
+	0x68, 0x2f, 0x63, 0x6c, 0x6f, 0x75, 0x64, 0x2d, 0x70, 0x6c, 0x61, 0x74, 0x66, 0x6f, 0x72, 0x6d,
+	0x42, 0xa0, 0x02, 0x0a, 0x28, 0x63, 0x6f, 0x6d, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e,
+	0x63, 0x6c, 0x6f, 0x75, 0x64, 0x2e, 0x64, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65, 0x72, 0x79, 0x65,
+	0x6e, 0x67, 0x69, 0x6e, 0x65, 0x2e, 0x76, 0x31, 0x61, 0x6c, 0x70, 0x68, 0x61, 0x42, 0x14, 0x44,
+	0x6f, 0x63, 0x75, 0x6d, 0x65, 0x6e, 0x74, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x50, 0x72,
+	0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x52, 0x63, 0x6c, 0x6f, 0x75, 0x64, 0x2e, 0x67, 0x6f, 0x6f,
+	0x67, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x67, 0x6f, 0x2f, 0x64, 0x69, 0x73, 0x63, 0x6f,
+	0x76, 0x65, 0x72, 0x79, 0x65, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x2f, 0x61, 0x70, 0x69, 0x76, 0x31,
+	0x61, 0x6c, 0x70, 0x68, 0x61, 0x2f, 0x64, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65, 0x72, 0x79, 0x65,
+	0x6e, 0x67, 0x69, 0x6e, 0x65, 0x70, 0x62, 0x3b, 0x64, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65, 0x72,
+	0x79, 0x65, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x70, 0x62, 0xa2, 0x02, 0x0f, 0x44, 0x49, 0x53, 0x43,
+	0x4f, 0x56, 0x45, 0x52, 0x59, 0x45, 0x4e, 0x47, 0x49, 0x4e, 0x45, 0xaa, 0x02, 0x24, 0x47, 0x6f,
+	0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x43, 0x6c, 0x6f, 0x75, 0x64, 0x2e, 0x44, 0x69, 0x73, 0x63, 0x6f,
+	0x76, 0x65, 0x72, 0x79, 0x45, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x2e, 0x56, 0x31, 0x41, 0x6c, 0x70,
+	0x68, 0x61, 0xca, 0x02, 0x24, 0x47, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x5c, 0x43, 0x6c, 0x6f, 0x75,
+	0x64, 0x5c, 0x44, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65, 0x72, 0x79, 0x45, 0x6e, 0x67, 0x69, 0x6e,
+	0x65, 0x5c, 0x56, 0x31, 0x61, 0x6c, 0x70, 0x68, 0x61, 0xea, 0x02, 0x27, 0x47, 0x6f, 0x6f, 0x67,
+	0x6c, 0x65, 0x3a, 0x3a, 0x43, 0x6c, 0x6f, 0x75, 0x64, 0x3a, 0x3a, 0x44, 0x69, 0x73, 0x63, 0x6f,
+	0x76, 0x65, 0x72, 0x79, 0x45, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x3a, 0x3a, 0x56, 0x31, 0x61, 0x6c,
+	0x70, 0x68, 0x61, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -773,45 +1014,54 @@ func file_google_cloud_discoveryengine_v1alpha_document_service_proto_rawDescGZI
 	return file_google_cloud_discoveryengine_v1alpha_document_service_proto_rawDescData
 }
 
-var file_google_cloud_discoveryengine_v1alpha_document_service_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
+var file_google_cloud_discoveryengine_v1alpha_document_service_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
+var file_google_cloud_discoveryengine_v1alpha_document_service_proto_msgTypes = make([]protoimpl.MessageInfo, 7)
 var file_google_cloud_discoveryengine_v1alpha_document_service_proto_goTypes = []interface{}{
-	(*GetDocumentRequest)(nil),      // 0: google.cloud.discoveryengine.v1alpha.GetDocumentRequest
-	(*ListDocumentsRequest)(nil),    // 1: google.cloud.discoveryengine.v1alpha.ListDocumentsRequest
-	(*ListDocumentsResponse)(nil),   // 2: google.cloud.discoveryengine.v1alpha.ListDocumentsResponse
-	(*CreateDocumentRequest)(nil),   // 3: google.cloud.discoveryengine.v1alpha.CreateDocumentRequest
-	(*UpdateDocumentRequest)(nil),   // 4: google.cloud.discoveryengine.v1alpha.UpdateDocumentRequest
-	(*DeleteDocumentRequest)(nil),   // 5: google.cloud.discoveryengine.v1alpha.DeleteDocumentRequest
-	(*Document)(nil),                // 6: google.cloud.discoveryengine.v1alpha.Document
-	(*fieldmaskpb.FieldMask)(nil),   // 7: google.protobuf.FieldMask
-	(*ImportDocumentsRequest)(nil),  // 8: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest
-	(*PurgeDocumentsRequest)(nil),   // 9: google.cloud.discoveryengine.v1alpha.PurgeDocumentsRequest
-	(*emptypb.Empty)(nil),           // 10: google.protobuf.Empty
-	(*longrunningpb.Operation)(nil), // 11: google.longrunning.Operation
+	(GetProcessedDocumentRequest_ProcessedDocumentType)(0),   // 0: google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest.ProcessedDocumentType
+	(GetProcessedDocumentRequest_ProcessedDocumentFormat)(0), // 1: google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest.ProcessedDocumentFormat
+	(*GetDocumentRequest)(nil),                               // 2: google.cloud.discoveryengine.v1alpha.GetDocumentRequest
+	(*ListDocumentsRequest)(nil),                             // 3: google.cloud.discoveryengine.v1alpha.ListDocumentsRequest
+	(*ListDocumentsResponse)(nil),                            // 4: google.cloud.discoveryengine.v1alpha.ListDocumentsResponse
+	(*CreateDocumentRequest)(nil),                            // 5: google.cloud.discoveryengine.v1alpha.CreateDocumentRequest
+	(*UpdateDocumentRequest)(nil),                            // 6: google.cloud.discoveryengine.v1alpha.UpdateDocumentRequest
+	(*DeleteDocumentRequest)(nil),                            // 7: google.cloud.discoveryengine.v1alpha.DeleteDocumentRequest
+	(*GetProcessedDocumentRequest)(nil),                      // 8: google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest
+	(*Document)(nil),                                         // 9: google.cloud.discoveryengine.v1alpha.Document
+	(*fieldmaskpb.FieldMask)(nil),                            // 10: google.protobuf.FieldMask
+	(*ImportDocumentsRequest)(nil),                           // 11: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest
+	(*PurgeDocumentsRequest)(nil),                            // 12: google.cloud.discoveryengine.v1alpha.PurgeDocumentsRequest
+	(*emptypb.Empty)(nil),                                    // 13: google.protobuf.Empty
+	(*longrunningpb.Operation)(nil),                          // 14: google.longrunning.Operation
+	(*ProcessedDocument)(nil),                                // 15: google.cloud.discoveryengine.v1alpha.ProcessedDocument
 }
 var file_google_cloud_discoveryengine_v1alpha_document_service_proto_depIdxs = []int32{
-	6,  // 0: google.cloud.discoveryengine.v1alpha.ListDocumentsResponse.documents:type_name -> google.cloud.discoveryengine.v1alpha.Document
-	6,  // 1: google.cloud.discoveryengine.v1alpha.CreateDocumentRequest.document:type_name -> google.cloud.discoveryengine.v1alpha.Document
-	6,  // 2: google.cloud.discoveryengine.v1alpha.UpdateDocumentRequest.document:type_name -> google.cloud.discoveryengine.v1alpha.Document
-	7,  // 3: google.cloud.discoveryengine.v1alpha.UpdateDocumentRequest.update_mask:type_name -> google.protobuf.FieldMask
-	0,  // 4: google.cloud.discoveryengine.v1alpha.DocumentService.GetDocument:input_type -> google.cloud.discoveryengine.v1alpha.GetDocumentRequest
-	1,  // 5: google.cloud.discoveryengine.v1alpha.DocumentService.ListDocuments:input_type -> google.cloud.discoveryengine.v1alpha.ListDocumentsRequest
-	3,  // 6: google.cloud.discoveryengine.v1alpha.DocumentService.CreateDocument:input_type -> google.cloud.discoveryengine.v1alpha.CreateDocumentRequest
-	4,  // 7: google.cloud.discoveryengine.v1alpha.DocumentService.UpdateDocument:input_type -> google.cloud.discoveryengine.v1alpha.UpdateDocumentRequest
-	5,  // 8: google.cloud.discoveryengine.v1alpha.DocumentService.DeleteDocument:input_type -> google.cloud.discoveryengine.v1alpha.DeleteDocumentRequest
-	8,  // 9: google.cloud.discoveryengine.v1alpha.DocumentService.ImportDocuments:input_type -> google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest
-	9,  // 10: google.cloud.discoveryengine.v1alpha.DocumentService.PurgeDocuments:input_type -> google.cloud.discoveryengine.v1alpha.PurgeDocumentsRequest
-	6,  // 11: google.cloud.discoveryengine.v1alpha.DocumentService.GetDocument:output_type -> google.cloud.discoveryengine.v1alpha.Document
-	2,  // 12: google.cloud.discoveryengine.v1alpha.DocumentService.ListDocuments:output_type -> google.cloud.discoveryengine.v1alpha.ListDocumentsResponse
-	6,  // 13: google.cloud.discoveryengine.v1alpha.DocumentService.CreateDocument:output_type -> google.cloud.discoveryengine.v1alpha.Document
-	6,  // 14: google.cloud.discoveryengine.v1alpha.DocumentService.UpdateDocument:output_type -> google.cloud.discoveryengine.v1alpha.Document
-	10, // 15: google.cloud.discoveryengine.v1alpha.DocumentService.DeleteDocument:output_type -> google.protobuf.Empty
-	11, // 16: google.cloud.discoveryengine.v1alpha.DocumentService.ImportDocuments:output_type -> google.longrunning.Operation
-	11, // 17: google.cloud.discoveryengine.v1alpha.DocumentService.PurgeDocuments:output_type -> google.longrunning.Operation
-	11, // [11:18] is the sub-list for method output_type
-	4,  // [4:11] is the sub-list for method input_type
-	4,  // [4:4] is the sub-list for extension type_name
-	4,  // [4:4] is the sub-list for extension extendee
-	0,  // [0:4] is the sub-list for field type_name
+	9,  // 0: google.cloud.discoveryengine.v1alpha.ListDocumentsResponse.documents:type_name -> google.cloud.discoveryengine.v1alpha.Document
+	9,  // 1: google.cloud.discoveryengine.v1alpha.CreateDocumentRequest.document:type_name -> google.cloud.discoveryengine.v1alpha.Document
+	9,  // 2: google.cloud.discoveryengine.v1alpha.UpdateDocumentRequest.document:type_name -> google.cloud.discoveryengine.v1alpha.Document
+	10, // 3: google.cloud.discoveryengine.v1alpha.UpdateDocumentRequest.update_mask:type_name -> google.protobuf.FieldMask
+	0,  // 4: google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest.processed_document_type:type_name -> google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest.ProcessedDocumentType
+	1,  // 5: google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest.processed_document_format:type_name -> google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest.ProcessedDocumentFormat
+	2,  // 6: google.cloud.discoveryengine.v1alpha.DocumentService.GetDocument:input_type -> google.cloud.discoveryengine.v1alpha.GetDocumentRequest
+	3,  // 7: google.cloud.discoveryengine.v1alpha.DocumentService.ListDocuments:input_type -> google.cloud.discoveryengine.v1alpha.ListDocumentsRequest
+	5,  // 8: google.cloud.discoveryengine.v1alpha.DocumentService.CreateDocument:input_type -> google.cloud.discoveryengine.v1alpha.CreateDocumentRequest
+	6,  // 9: google.cloud.discoveryengine.v1alpha.DocumentService.UpdateDocument:input_type -> google.cloud.discoveryengine.v1alpha.UpdateDocumentRequest
+	7,  // 10: google.cloud.discoveryengine.v1alpha.DocumentService.DeleteDocument:input_type -> google.cloud.discoveryengine.v1alpha.DeleteDocumentRequest
+	11, // 11: google.cloud.discoveryengine.v1alpha.DocumentService.ImportDocuments:input_type -> google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest
+	12, // 12: google.cloud.discoveryengine.v1alpha.DocumentService.PurgeDocuments:input_type -> google.cloud.discoveryengine.v1alpha.PurgeDocumentsRequest
+	8,  // 13: google.cloud.discoveryengine.v1alpha.DocumentService.GetProcessedDocument:input_type -> google.cloud.discoveryengine.v1alpha.GetProcessedDocumentRequest
+	9,  // 14: google.cloud.discoveryengine.v1alpha.DocumentService.GetDocument:output_type -> google.cloud.discoveryengine.v1alpha.Document
+	4,  // 15: google.cloud.discoveryengine.v1alpha.DocumentService.ListDocuments:output_type -> google.cloud.discoveryengine.v1alpha.ListDocumentsResponse
+	9,  // 16: google.cloud.discoveryengine.v1alpha.DocumentService.CreateDocument:output_type -> google.cloud.discoveryengine.v1alpha.Document
+	9,  // 17: google.cloud.discoveryengine.v1alpha.DocumentService.UpdateDocument:output_type -> google.cloud.discoveryengine.v1alpha.Document
+	13, // 18: google.cloud.discoveryengine.v1alpha.DocumentService.DeleteDocument:output_type -> google.protobuf.Empty
+	14, // 19: google.cloud.discoveryengine.v1alpha.DocumentService.ImportDocuments:output_type -> google.longrunning.Operation
+	14, // 20: google.cloud.discoveryengine.v1alpha.DocumentService.PurgeDocuments:output_type -> google.longrunning.Operation
+	15, // 21: google.cloud.discoveryengine.v1alpha.DocumentService.GetProcessedDocument:output_type -> google.cloud.discoveryengine.v1alpha.ProcessedDocument
+	14, // [14:22] is the sub-list for method output_type
+	6,  // [6:14] is the sub-list for method input_type
+	6,  // [6:6] is the sub-list for extension type_name
+	6,  // [6:6] is the sub-list for extension extendee
+	0,  // [0:6] is the sub-list for field type_name
 }
 
 func init() { file_google_cloud_discoveryengine_v1alpha_document_service_proto_init() }
@@ -895,19 +1145,32 @@ func file_google_cloud_discoveryengine_v1alpha_document_service_proto_init() {
 				return nil
 			}
 		}
+		file_google_cloud_discoveryengine_v1alpha_document_service_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetProcessedDocumentRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_cloud_discoveryengine_v1alpha_document_service_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   6,
+			NumEnums:      2,
+			NumMessages:   7,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
 		GoTypes:           file_google_cloud_discoveryengine_v1alpha_document_service_proto_goTypes,
 		DependencyIndexes: file_google_cloud_discoveryengine_v1alpha_document_service_proto_depIdxs,
+		EnumInfos:         file_google_cloud_discoveryengine_v1alpha_document_service_proto_enumTypes,
 		MessageInfos:      file_google_cloud_discoveryengine_v1alpha_document_service_proto_msgTypes,
 	}.Build()
 	File_google_cloud_discoveryengine_v1alpha_document_service_proto = out.File
@@ -964,6 +1227,9 @@ type DocumentServiceClient interface {
 	// [PurgeDocumentsRequest.force][google.cloud.discoveryengine.v1alpha.PurgeDocumentsRequest.force]
 	// to false.
 	PurgeDocuments(ctx context.Context, in *PurgeDocumentsRequest, opts ...grpc.CallOption) (*longrunningpb.Operation, error)
+	// Gets the parsed layout information for a
+	// [Document][google.cloud.discoveryengine.v1alpha.Document].
+	GetProcessedDocument(ctx context.Context, in *GetProcessedDocumentRequest, opts ...grpc.CallOption) (*ProcessedDocument, error)
 }
 
 type documentServiceClient struct {
@@ -1037,6 +1303,15 @@ func (c *documentServiceClient) PurgeDocuments(ctx context.Context, in *PurgeDoc
 	return out, nil
 }
 
+func (c *documentServiceClient) GetProcessedDocument(ctx context.Context, in *GetProcessedDocumentRequest, opts ...grpc.CallOption) (*ProcessedDocument, error) {
+	out := new(ProcessedDocument)
+	err := c.cc.Invoke(ctx, "/google.cloud.discoveryengine.v1alpha.DocumentService/GetProcessedDocument", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // DocumentServiceServer is the server API for DocumentService service.
 type DocumentServiceServer interface {
 	// Gets a [Document][google.cloud.discoveryengine.v1alpha.Document].
@@ -1075,6 +1350,9 @@ type DocumentServiceServer interface {
 	// [PurgeDocumentsRequest.force][google.cloud.discoveryengine.v1alpha.PurgeDocumentsRequest.force]
 	// to false.
 	PurgeDocuments(context.Context, *PurgeDocumentsRequest) (*longrunningpb.Operation, error)
+	// Gets the parsed layout information for a
+	// [Document][google.cloud.discoveryengine.v1alpha.Document].
+	GetProcessedDocument(context.Context, *GetProcessedDocumentRequest) (*ProcessedDocument, error)
 }
 
 // UnimplementedDocumentServiceServer can be embedded to have forward compatible implementations.
@@ -1102,6 +1380,9 @@ func (*UnimplementedDocumentServiceServer) ImportDocuments(context.Context, *Imp
 func (*UnimplementedDocumentServiceServer) PurgeDocuments(context.Context, *PurgeDocumentsRequest) (*longrunningpb.Operation, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method PurgeDocuments not implemented")
 }
+func (*UnimplementedDocumentServiceServer) GetProcessedDocument(context.Context, *GetProcessedDocumentRequest) (*ProcessedDocument, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetProcessedDocument not implemented")
+}
 
 func RegisterDocumentServiceServer(s *grpc.Server, srv DocumentServiceServer) {
 	s.RegisterService(&_DocumentService_serviceDesc, srv)
@@ -1233,6 +1514,24 @@ func _DocumentService_PurgeDocuments_Handler(srv interface{}, ctx context.Contex
 	return interceptor(ctx, in, info, handler)
 }
 
+func _DocumentService_GetProcessedDocument_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetProcessedDocumentRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(DocumentServiceServer).GetProcessedDocument(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/google.cloud.discoveryengine.v1alpha.DocumentService/GetProcessedDocument",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(DocumentServiceServer).GetProcessedDocument(ctx, req.(*GetProcessedDocumentRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _DocumentService_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "google.cloud.discoveryengine.v1alpha.DocumentService",
 	HandlerType: (*DocumentServiceServer)(nil),
@@ -1265,6 +1564,10 @@ var _DocumentService_serviceDesc = grpc.ServiceDesc{
 			MethodName: "PurgeDocuments",
 			Handler:    _DocumentService_PurgeDocuments_Handler,
 		},
+		{
+			MethodName: "GetProcessedDocument",
+			Handler:    _DocumentService_GetProcessedDocument_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "google/cloud/discoveryengine/v1alpha/document_service.proto",
diff --git a/discoveryengine/apiv1alpha/discoveryenginepb/import_config.pb.go b/discoveryengine/apiv1alpha/discoveryenginepb/import_config.pb.go
index 89e6f51cf7c1..0dcab2598783 100755
--- a/discoveryengine/apiv1alpha/discoveryenginepb/import_config.pb.go
+++ b/discoveryengine/apiv1alpha/discoveryenginepb/import_config.pb.go
@@ -29,6 +29,7 @@ import (
 	date "google.golang.org/genproto/googleapis/type/date"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	fieldmaskpb "google.golang.org/protobuf/types/known/fieldmaskpb"
 	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 )
 
@@ -39,6 +40,136 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+// The type of values in a Bigtable column or column family.
+// The values are expected to be encoded using
+// [HBase
+// Bytes.toBytes](https://hbase.apache.org/apidocs/org/apache/hadoop/hbase/util/Bytes.html)
+// function when the encoding value is set to `BINARY`.
+type BigtableOptions_Type int32
+
+const (
+	// The type is unspecified.
+	BigtableOptions_TYPE_UNSPECIFIED BigtableOptions_Type = 0
+	// String type.
+	BigtableOptions_STRING BigtableOptions_Type = 1
+	// Numerical type.
+	BigtableOptions_NUMBER BigtableOptions_Type = 2
+	// Integer type.
+	BigtableOptions_INTEGER BigtableOptions_Type = 3
+	// Variable length integer type.
+	BigtableOptions_VAR_INTEGER BigtableOptions_Type = 4
+	// BigDecimal type.
+	BigtableOptions_BIG_NUMERIC BigtableOptions_Type = 5
+	// Boolean type.
+	BigtableOptions_BOOLEAN BigtableOptions_Type = 6
+	// JSON type.
+	BigtableOptions_JSON BigtableOptions_Type = 7
+)
+
+// Enum value maps for BigtableOptions_Type.
+var (
+	BigtableOptions_Type_name = map[int32]string{
+		0: "TYPE_UNSPECIFIED",
+		1: "STRING",
+		2: "NUMBER",
+		3: "INTEGER",
+		4: "VAR_INTEGER",
+		5: "BIG_NUMERIC",
+		6: "BOOLEAN",
+		7: "JSON",
+	}
+	BigtableOptions_Type_value = map[string]int32{
+		"TYPE_UNSPECIFIED": 0,
+		"STRING":           1,
+		"NUMBER":           2,
+		"INTEGER":          3,
+		"VAR_INTEGER":      4,
+		"BIG_NUMERIC":      5,
+		"BOOLEAN":          6,
+		"JSON":             7,
+	}
+)
+
+func (x BigtableOptions_Type) Enum() *BigtableOptions_Type {
+	p := new(BigtableOptions_Type)
+	*p = x
+	return p
+}
+
+func (x BigtableOptions_Type) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (BigtableOptions_Type) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes[0].Descriptor()
+}
+
+func (BigtableOptions_Type) Type() protoreflect.EnumType {
+	return &file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes[0]
+}
+
+func (x BigtableOptions_Type) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use BigtableOptions_Type.Descriptor instead.
+func (BigtableOptions_Type) EnumDescriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{3, 0}
+}
+
+// The encoding mode of a Bigtable column or column family.
+type BigtableOptions_Encoding int32
+
+const (
+	// The encoding is unspecified.
+	BigtableOptions_ENCODING_UNSPECIFIED BigtableOptions_Encoding = 0
+	// Text encoding.
+	BigtableOptions_TEXT BigtableOptions_Encoding = 1
+	// Binary encoding.
+	BigtableOptions_BINARY BigtableOptions_Encoding = 2
+)
+
+// Enum value maps for BigtableOptions_Encoding.
+var (
+	BigtableOptions_Encoding_name = map[int32]string{
+		0: "ENCODING_UNSPECIFIED",
+		1: "TEXT",
+		2: "BINARY",
+	}
+	BigtableOptions_Encoding_value = map[string]int32{
+		"ENCODING_UNSPECIFIED": 0,
+		"TEXT":                 1,
+		"BINARY":               2,
+	}
+)
+
+func (x BigtableOptions_Encoding) Enum() *BigtableOptions_Encoding {
+	p := new(BigtableOptions_Encoding)
+	*p = x
+	return p
+}
+
+func (x BigtableOptions_Encoding) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (BigtableOptions_Encoding) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes[1].Descriptor()
+}
+
+func (BigtableOptions_Encoding) Type() protoreflect.EnumType {
+	return &file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes[1]
+}
+
+func (x BigtableOptions_Encoding) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use BigtableOptions_Encoding.Descriptor instead.
+func (BigtableOptions_Encoding) EnumDescriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{3, 1}
+}
+
 // Indicates how imported documents are reconciled with the existing documents
 // created or imported before.
 type ImportDocumentsRequest_ReconciliationMode int32
@@ -78,11 +209,11 @@ func (x ImportDocumentsRequest_ReconciliationMode) String() string {
 }
 
 func (ImportDocumentsRequest_ReconciliationMode) Descriptor() protoreflect.EnumDescriptor {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes[0].Descriptor()
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes[2].Descriptor()
 }
 
 func (ImportDocumentsRequest_ReconciliationMode) Type() protoreflect.EnumType {
-	return &file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes[0]
+	return &file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes[2]
 }
 
 func (x ImportDocumentsRequest_ReconciliationMode) Number() protoreflect.EnumNumber {
@@ -91,7 +222,7 @@ func (x ImportDocumentsRequest_ReconciliationMode) Number() protoreflect.EnumNum
 
 // Deprecated: Use ImportDocumentsRequest_ReconciliationMode.Descriptor instead.
 func (ImportDocumentsRequest_ReconciliationMode) EnumDescriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{7, 0}
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{13, 0}
 }
 
 // Cloud Storage location for input content.
@@ -328,22 +459,30 @@ type BigQuerySource_PartitionDate struct {
 
 func (*BigQuerySource_PartitionDate) isBigQuerySource_Partition() {}
 
-// Configuration of destination for Import related errors.
-type ImportErrorConfig struct {
+// The Spanner source for importing data
+type SpannerSource struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Required. Errors destination.
-	//
-	// Types that are assignable to Destination:
-	//
-	//	*ImportErrorConfig_GcsPrefix
-	Destination isImportErrorConfig_Destination `protobuf_oneof:"destination"`
-}
-
-func (x *ImportErrorConfig) Reset() {
-	*x = ImportErrorConfig{}
+	// The project ID that the Spanner source is in with a length limit of 128
+	// characters. If not specified, inherits the project ID from the parent
+	// request.
+	ProjectId string `protobuf:"bytes,1,opt,name=project_id,json=projectId,proto3" json:"project_id,omitempty"`
+	// Required. The instance ID of the source Spanner table.
+	InstanceId string `protobuf:"bytes,2,opt,name=instance_id,json=instanceId,proto3" json:"instance_id,omitempty"`
+	// Required. The database ID of the source Spanner table.
+	DatabaseId string `protobuf:"bytes,3,opt,name=database_id,json=databaseId,proto3" json:"database_id,omitempty"`
+	// Required. The table name of the Spanner database that needs to be imported.
+	TableId string `protobuf:"bytes,4,opt,name=table_id,json=tableId,proto3" json:"table_id,omitempty"`
+	// Whether to apply data boost on Spanner export. Enabling this option will
+	// incur additional cost. More info can be found
+	// [here](https://cloud.google.com/spanner/docs/databoost/databoost-overview#billing_and_quotas).
+	EnableDataBoost bool `protobuf:"varint,5,opt,name=enable_data_boost,json=enableDataBoost,proto3" json:"enable_data_boost,omitempty"`
+}
+
+func (x *SpannerSource) Reset() {
+	*x = SpannerSource{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -351,13 +490,13 @@ func (x *ImportErrorConfig) Reset() {
 	}
 }
 
-func (x *ImportErrorConfig) String() string {
+func (x *SpannerSource) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*ImportErrorConfig) ProtoMessage() {}
+func (*SpannerSource) ProtoMessage() {}
 
-func (x *ImportErrorConfig) ProtoReflect() protoreflect.Message {
+func (x *SpannerSource) ProtoReflect() protoreflect.Message {
 	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -369,63 +508,64 @@ func (x *ImportErrorConfig) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use ImportErrorConfig.ProtoReflect.Descriptor instead.
-func (*ImportErrorConfig) Descriptor() ([]byte, []int) {
+// Deprecated: Use SpannerSource.ProtoReflect.Descriptor instead.
+func (*SpannerSource) Descriptor() ([]byte, []int) {
 	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{2}
 }
 
-func (m *ImportErrorConfig) GetDestination() isImportErrorConfig_Destination {
-	if m != nil {
-		return m.Destination
+func (x *SpannerSource) GetProjectId() string {
+	if x != nil {
+		return x.ProjectId
 	}
-	return nil
+	return ""
 }
 
-func (x *ImportErrorConfig) GetGcsPrefix() string {
-	if x, ok := x.GetDestination().(*ImportErrorConfig_GcsPrefix); ok {
-		return x.GcsPrefix
+func (x *SpannerSource) GetInstanceId() string {
+	if x != nil {
+		return x.InstanceId
 	}
 	return ""
 }
 
-type isImportErrorConfig_Destination interface {
-	isImportErrorConfig_Destination()
+func (x *SpannerSource) GetDatabaseId() string {
+	if x != nil {
+		return x.DatabaseId
+	}
+	return ""
 }
 
-type ImportErrorConfig_GcsPrefix struct {
-	// Cloud Storage prefix for import errors. This must be an empty,
-	// existing Cloud Storage directory. Import errors are written to
-	// sharded files in this directory, one per line, as a JSON-encoded
-	// `google.rpc.Status` message.
-	GcsPrefix string `protobuf:"bytes,1,opt,name=gcs_prefix,json=gcsPrefix,proto3,oneof"`
+func (x *SpannerSource) GetTableId() string {
+	if x != nil {
+		return x.TableId
+	}
+	return ""
 }
 
-func (*ImportErrorConfig_GcsPrefix) isImportErrorConfig_Destination() {}
+func (x *SpannerSource) GetEnableDataBoost() bool {
+	if x != nil {
+		return x.EnableDataBoost
+	}
+	return false
+}
 
-// Request message for the ImportUserEvents request.
-type ImportUserEventsRequest struct {
+// The Bigtable Options object that contains information to support
+// the import.
+type BigtableOptions struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Required - The desired input source of the user event data.
-	//
-	// Types that are assignable to Source:
-	//
-	//	*ImportUserEventsRequest_InlineSource_
-	//	*ImportUserEventsRequest_GcsSource
-	//	*ImportUserEventsRequest_BigquerySource
-	Source isImportUserEventsRequest_Source `protobuf_oneof:"source"`
-	// Required. Parent DataStore resource name, of the form
-	// `projects/{project}/locations/{location}/collections/{collection}/dataStores/{data_store}`
-	Parent string `protobuf:"bytes,1,opt,name=parent,proto3" json:"parent,omitempty"`
-	// The desired location of errors incurred during the Import. Cannot be set
-	// for inline user event imports.
-	ErrorConfig *ImportErrorConfig `protobuf:"bytes,5,opt,name=error_config,json=errorConfig,proto3" json:"error_config,omitempty"`
+	// The field name used for saving row key value in the document. The name has
+	// to match the pattern `[a-zA-Z0-9][a-zA-Z0-9-_]*`.
+	KeyFieldName string `protobuf:"bytes,1,opt,name=key_field_name,json=keyFieldName,proto3" json:"key_field_name,omitempty"`
+	// The mapping from family names to an object that contains column families
+	// level information for the given column family. If a family is not present
+	// in this map it will be ignored.
+	Families map[string]*BigtableOptions_BigtableColumnFamily `protobuf:"bytes,2,rep,name=families,proto3" json:"families,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
-func (x *ImportUserEventsRequest) Reset() {
-	*x = ImportUserEventsRequest{}
+func (x *BigtableOptions) Reset() {
+	*x = BigtableOptions{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -433,13 +573,13 @@ func (x *ImportUserEventsRequest) Reset() {
 	}
 }
 
-func (x *ImportUserEventsRequest) String() string {
+func (x *BigtableOptions) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*ImportUserEventsRequest) ProtoMessage() {}
+func (*BigtableOptions) ProtoMessage() {}
 
-func (x *ImportUserEventsRequest) ProtoReflect() protoreflect.Message {
+func (x *BigtableOptions) ProtoReflect() protoreflect.Message {
 	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -451,100 +591,46 @@ func (x *ImportUserEventsRequest) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use ImportUserEventsRequest.ProtoReflect.Descriptor instead.
-func (*ImportUserEventsRequest) Descriptor() ([]byte, []int) {
+// Deprecated: Use BigtableOptions.ProtoReflect.Descriptor instead.
+func (*BigtableOptions) Descriptor() ([]byte, []int) {
 	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{3}
 }
 
-func (m *ImportUserEventsRequest) GetSource() isImportUserEventsRequest_Source {
-	if m != nil {
-		return m.Source
-	}
-	return nil
-}
-
-func (x *ImportUserEventsRequest) GetInlineSource() *ImportUserEventsRequest_InlineSource {
-	if x, ok := x.GetSource().(*ImportUserEventsRequest_InlineSource_); ok {
-		return x.InlineSource
-	}
-	return nil
-}
-
-func (x *ImportUserEventsRequest) GetGcsSource() *GcsSource {
-	if x, ok := x.GetSource().(*ImportUserEventsRequest_GcsSource); ok {
-		return x.GcsSource
-	}
-	return nil
-}
-
-func (x *ImportUserEventsRequest) GetBigquerySource() *BigQuerySource {
-	if x, ok := x.GetSource().(*ImportUserEventsRequest_BigquerySource); ok {
-		return x.BigquerySource
-	}
-	return nil
-}
-
-func (x *ImportUserEventsRequest) GetParent() string {
+func (x *BigtableOptions) GetKeyFieldName() string {
 	if x != nil {
-		return x.Parent
+		return x.KeyFieldName
 	}
 	return ""
 }
 
-func (x *ImportUserEventsRequest) GetErrorConfig() *ImportErrorConfig {
+func (x *BigtableOptions) GetFamilies() map[string]*BigtableOptions_BigtableColumnFamily {
 	if x != nil {
-		return x.ErrorConfig
+		return x.Families
 	}
 	return nil
 }
 
-type isImportUserEventsRequest_Source interface {
-	isImportUserEventsRequest_Source()
-}
-
-type ImportUserEventsRequest_InlineSource_ struct {
-	// The Inline source for the input content for UserEvents.
-	InlineSource *ImportUserEventsRequest_InlineSource `protobuf:"bytes,2,opt,name=inline_source,json=inlineSource,proto3,oneof"`
-}
-
-type ImportUserEventsRequest_GcsSource struct {
-	// Cloud Storage location for the input content.
-	GcsSource *GcsSource `protobuf:"bytes,3,opt,name=gcs_source,json=gcsSource,proto3,oneof"`
-}
-
-type ImportUserEventsRequest_BigquerySource struct {
-	// BigQuery input source.
-	BigquerySource *BigQuerySource `protobuf:"bytes,4,opt,name=bigquery_source,json=bigquerySource,proto3,oneof"`
-}
-
-func (*ImportUserEventsRequest_InlineSource_) isImportUserEventsRequest_Source() {}
-
-func (*ImportUserEventsRequest_GcsSource) isImportUserEventsRequest_Source() {}
-
-func (*ImportUserEventsRequest_BigquerySource) isImportUserEventsRequest_Source() {}
-
-// Response of the ImportUserEventsRequest. If the long running
-// operation was successful, then this message is returned by the
-// google.longrunning.Operations.response field if the operation was successful.
-type ImportUserEventsResponse struct {
+// The Cloud Bigtable source for importing data.
+type BigtableSource struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// A sample of errors encountered while processing the request.
-	ErrorSamples []*status.Status `protobuf:"bytes,1,rep,name=error_samples,json=errorSamples,proto3" json:"error_samples,omitempty"`
-	// Echoes the destination for the complete errors if this field was set in
-	// the request.
-	ErrorConfig *ImportErrorConfig `protobuf:"bytes,2,opt,name=error_config,json=errorConfig,proto3" json:"error_config,omitempty"`
-	// Count of user events imported with complete existing Documents.
-	JoinedEventsCount int64 `protobuf:"varint,3,opt,name=joined_events_count,json=joinedEventsCount,proto3" json:"joined_events_count,omitempty"`
-	// Count of user events imported, but with Document information not found
-	// in the existing Branch.
-	UnjoinedEventsCount int64 `protobuf:"varint,4,opt,name=unjoined_events_count,json=unjoinedEventsCount,proto3" json:"unjoined_events_count,omitempty"`
+	// The project ID that the Bigtable source is in with a length limit of 128
+	// characters. If not specified, inherits the project ID from the parent
+	// request.
+	ProjectId string `protobuf:"bytes,1,opt,name=project_id,json=projectId,proto3" json:"project_id,omitempty"`
+	// Required. The instance ID of the Cloud Bigtable that needs to be imported.
+	InstanceId string `protobuf:"bytes,2,opt,name=instance_id,json=instanceId,proto3" json:"instance_id,omitempty"`
+	// Required. The table ID of the Cloud Bigtable that needs to be imported.
+	TableId string `protobuf:"bytes,3,opt,name=table_id,json=tableId,proto3" json:"table_id,omitempty"`
+	// Required. Bigtable options that contains information needed when parsing
+	// data into typed structures. For example, column type annotations.
+	BigtableOptions *BigtableOptions `protobuf:"bytes,4,opt,name=bigtable_options,json=bigtableOptions,proto3" json:"bigtable_options,omitempty"`
 }
 
-func (x *ImportUserEventsResponse) Reset() {
-	*x = ImportUserEventsResponse{}
+func (x *BigtableSource) Reset() {
+	*x = BigtableSource{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -552,13 +638,13 @@ func (x *ImportUserEventsResponse) Reset() {
 	}
 }
 
-func (x *ImportUserEventsResponse) String() string {
+func (x *BigtableSource) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*ImportUserEventsResponse) ProtoMessage() {}
+func (*BigtableSource) ProtoMessage() {}
 
-func (x *ImportUserEventsResponse) ProtoReflect() protoreflect.Message {
+func (x *BigtableSource) ProtoReflect() protoreflect.Message {
 	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -570,59 +656,57 @@ func (x *ImportUserEventsResponse) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use ImportUserEventsResponse.ProtoReflect.Descriptor instead.
-func (*ImportUserEventsResponse) Descriptor() ([]byte, []int) {
+// Deprecated: Use BigtableSource.ProtoReflect.Descriptor instead.
+func (*BigtableSource) Descriptor() ([]byte, []int) {
 	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{4}
 }
 
-func (x *ImportUserEventsResponse) GetErrorSamples() []*status.Status {
+func (x *BigtableSource) GetProjectId() string {
 	if x != nil {
-		return x.ErrorSamples
+		return x.ProjectId
 	}
-	return nil
+	return ""
 }
 
-func (x *ImportUserEventsResponse) GetErrorConfig() *ImportErrorConfig {
+func (x *BigtableSource) GetInstanceId() string {
 	if x != nil {
-		return x.ErrorConfig
+		return x.InstanceId
 	}
-	return nil
+	return ""
 }
 
-func (x *ImportUserEventsResponse) GetJoinedEventsCount() int64 {
+func (x *BigtableSource) GetTableId() string {
 	if x != nil {
-		return x.JoinedEventsCount
+		return x.TableId
 	}
-	return 0
+	return ""
 }
 
-func (x *ImportUserEventsResponse) GetUnjoinedEventsCount() int64 {
+func (x *BigtableSource) GetBigtableOptions() *BigtableOptions {
 	if x != nil {
-		return x.UnjoinedEventsCount
+		return x.BigtableOptions
 	}
-	return 0
+	return nil
 }
 
-// Metadata related to the progress of the Import operation. This is
-// returned by the google.longrunning.Operation.metadata field.
-type ImportUserEventsMetadata struct {
+// Cloud FhirStore source import data from.
+type FhirStoreSource struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Operation create time.
-	CreateTime *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=create_time,json=createTime,proto3" json:"create_time,omitempty"`
-	// Operation last update time. If the operation is done, this is also the
-	// finish time.
-	UpdateTime *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=update_time,json=updateTime,proto3" json:"update_time,omitempty"`
-	// Count of entries that were processed successfully.
-	SuccessCount int64 `protobuf:"varint,3,opt,name=success_count,json=successCount,proto3" json:"success_count,omitempty"`
-	// Count of entries that encountered errors while processing.
-	FailureCount int64 `protobuf:"varint,4,opt,name=failure_count,json=failureCount,proto3" json:"failure_count,omitempty"`
+	// Required. The full resource name of the FHIR store to import data from, in
+	// the format of
+	// `projects/{project}/locations/{location}/datasets/{dataset}/fhirStores/{fhir_store}`.
+	FhirStore string `protobuf:"bytes,1,opt,name=fhir_store,json=fhirStore,proto3" json:"fhir_store,omitempty"`
+	// Intermediate Cloud Storage directory used for the import with a length
+	// limit of 2,000 characters. Can be specified if one wants to have the
+	// FhirStore export to a specific Cloud Storage directory.
+	GcsStagingDir string `protobuf:"bytes,2,opt,name=gcs_staging_dir,json=gcsStagingDir,proto3" json:"gcs_staging_dir,omitempty"`
 }
 
-func (x *ImportUserEventsMetadata) Reset() {
-	*x = ImportUserEventsMetadata{}
+func (x *FhirStoreSource) Reset() {
+	*x = FhirStoreSource{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[5]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -630,13 +714,13 @@ func (x *ImportUserEventsMetadata) Reset() {
 	}
 }
 
-func (x *ImportUserEventsMetadata) String() string {
+func (x *FhirStoreSource) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*ImportUserEventsMetadata) ProtoMessage() {}
+func (*FhirStoreSource) ProtoMessage() {}
 
-func (x *ImportUserEventsMetadata) ProtoReflect() protoreflect.Message {
+func (x *FhirStoreSource) ProtoReflect() protoreflect.Message {
 	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[5]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -648,27 +732,557 @@ func (x *ImportUserEventsMetadata) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use ImportUserEventsMetadata.ProtoReflect.Descriptor instead.
-func (*ImportUserEventsMetadata) Descriptor() ([]byte, []int) {
+// Deprecated: Use FhirStoreSource.ProtoReflect.Descriptor instead.
+func (*FhirStoreSource) Descriptor() ([]byte, []int) {
 	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{5}
 }
 
-func (x *ImportUserEventsMetadata) GetCreateTime() *timestamppb.Timestamp {
+func (x *FhirStoreSource) GetFhirStore() string {
 	if x != nil {
-		return x.CreateTime
+		return x.FhirStore
 	}
-	return nil
+	return ""
 }
 
-func (x *ImportUserEventsMetadata) GetUpdateTime() *timestamppb.Timestamp {
+func (x *FhirStoreSource) GetGcsStagingDir() string {
 	if x != nil {
-		return x.UpdateTime
+		return x.GcsStagingDir
 	}
-	return nil
+	return ""
 }
 
-func (x *ImportUserEventsMetadata) GetSuccessCount() int64 {
-	if x != nil {
+// Cloud SQL source import data from.
+type CloudSqlSource struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The project ID that the Cloud SQL source is in with a length limit of 128
+	// characters. If not specified, inherits the project ID from the parent
+	// request.
+	ProjectId string `protobuf:"bytes,1,opt,name=project_id,json=projectId,proto3" json:"project_id,omitempty"`
+	// Required. The Cloud SQL instance to copy the data from with a length limit
+	// of 256 characters.
+	InstanceId string `protobuf:"bytes,2,opt,name=instance_id,json=instanceId,proto3" json:"instance_id,omitempty"`
+	// Required. The Cloud SQL database to copy the data from with a length limit
+	// of 256 characters.
+	DatabaseId string `protobuf:"bytes,3,opt,name=database_id,json=databaseId,proto3" json:"database_id,omitempty"`
+	// Required. The Cloud SQL table to copy the data from with a length limit of
+	// 256 characters.
+	TableId string `protobuf:"bytes,4,opt,name=table_id,json=tableId,proto3" json:"table_id,omitempty"`
+	// Intermediate Cloud Storage directory used for the import with a length
+	// limit of 2,000 characters. Can be specified if one wants to have the
+	// Cloud SQL export to a specific Cloud Storage directory.
+	//
+	// Please ensure that the Cloud SQL service account has the necessary Cloud
+	// Storage Admin permissions to access the specified Cloud Storage directory.
+	GcsStagingDir string `protobuf:"bytes,5,opt,name=gcs_staging_dir,json=gcsStagingDir,proto3" json:"gcs_staging_dir,omitempty"`
+	// Option for serverless export. Enabling this option will incur
+	// additional cost. More info can be found
+	// [here](https://cloud.google.com/sql/pricing#serverless).
+	Offload bool `protobuf:"varint,6,opt,name=offload,proto3" json:"offload,omitempty"`
+}
+
+func (x *CloudSqlSource) Reset() {
+	*x = CloudSqlSource{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CloudSqlSource) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CloudSqlSource) ProtoMessage() {}
+
+func (x *CloudSqlSource) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[6]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use CloudSqlSource.ProtoReflect.Descriptor instead.
+func (*CloudSqlSource) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *CloudSqlSource) GetProjectId() string {
+	if x != nil {
+		return x.ProjectId
+	}
+	return ""
+}
+
+func (x *CloudSqlSource) GetInstanceId() string {
+	if x != nil {
+		return x.InstanceId
+	}
+	return ""
+}
+
+func (x *CloudSqlSource) GetDatabaseId() string {
+	if x != nil {
+		return x.DatabaseId
+	}
+	return ""
+}
+
+func (x *CloudSqlSource) GetTableId() string {
+	if x != nil {
+		return x.TableId
+	}
+	return ""
+}
+
+func (x *CloudSqlSource) GetGcsStagingDir() string {
+	if x != nil {
+		return x.GcsStagingDir
+	}
+	return ""
+}
+
+func (x *CloudSqlSource) GetOffload() bool {
+	if x != nil {
+		return x.Offload
+	}
+	return false
+}
+
+// Firestore source import data from.
+type FirestoreSource struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The project ID that the Cloud SQL source is in with a length limit of 128
+	// characters. If not specified, inherits the project ID from the parent
+	// request.
+	ProjectId string `protobuf:"bytes,1,opt,name=project_id,json=projectId,proto3" json:"project_id,omitempty"`
+	// Required. The Firestore database to copy the data from with a length limit
+	// of 256 characters.
+	DatabaseId string `protobuf:"bytes,2,opt,name=database_id,json=databaseId,proto3" json:"database_id,omitempty"`
+	// Required. The Firestore collection to copy the data from with a length
+	// limit of 1,500 characters.
+	CollectionId string `protobuf:"bytes,3,opt,name=collection_id,json=collectionId,proto3" json:"collection_id,omitempty"`
+	// Intermediate Cloud Storage directory used for the import with a length
+	// limit of 2,000 characters. Can be specified if one wants to have the
+	// Firestore export to a specific Cloud Storage directory.
+	//
+	// Please ensure that the Firestore service account has the necessary Cloud
+	// Storage Admin permissions to access the specified Cloud Storage directory.
+	GcsStagingDir string `protobuf:"bytes,4,opt,name=gcs_staging_dir,json=gcsStagingDir,proto3" json:"gcs_staging_dir,omitempty"`
+}
+
+func (x *FirestoreSource) Reset() {
+	*x = FirestoreSource{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FirestoreSource) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FirestoreSource) ProtoMessage() {}
+
+func (x *FirestoreSource) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[7]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FirestoreSource.ProtoReflect.Descriptor instead.
+func (*FirestoreSource) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *FirestoreSource) GetProjectId() string {
+	if x != nil {
+		return x.ProjectId
+	}
+	return ""
+}
+
+func (x *FirestoreSource) GetDatabaseId() string {
+	if x != nil {
+		return x.DatabaseId
+	}
+	return ""
+}
+
+func (x *FirestoreSource) GetCollectionId() string {
+	if x != nil {
+		return x.CollectionId
+	}
+	return ""
+}
+
+func (x *FirestoreSource) GetGcsStagingDir() string {
+	if x != nil {
+		return x.GcsStagingDir
+	}
+	return ""
+}
+
+// Configuration of destination for Import related errors.
+type ImportErrorConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Required. Errors destination.
+	//
+	// Types that are assignable to Destination:
+	//
+	//	*ImportErrorConfig_GcsPrefix
+	Destination isImportErrorConfig_Destination `protobuf_oneof:"destination"`
+}
+
+func (x *ImportErrorConfig) Reset() {
+	*x = ImportErrorConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[8]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ImportErrorConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ImportErrorConfig) ProtoMessage() {}
+
+func (x *ImportErrorConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[8]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ImportErrorConfig.ProtoReflect.Descriptor instead.
+func (*ImportErrorConfig) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{8}
+}
+
+func (m *ImportErrorConfig) GetDestination() isImportErrorConfig_Destination {
+	if m != nil {
+		return m.Destination
+	}
+	return nil
+}
+
+func (x *ImportErrorConfig) GetGcsPrefix() string {
+	if x, ok := x.GetDestination().(*ImportErrorConfig_GcsPrefix); ok {
+		return x.GcsPrefix
+	}
+	return ""
+}
+
+type isImportErrorConfig_Destination interface {
+	isImportErrorConfig_Destination()
+}
+
+type ImportErrorConfig_GcsPrefix struct {
+	// Cloud Storage prefix for import errors. This must be an empty,
+	// existing Cloud Storage directory. Import errors are written to
+	// sharded files in this directory, one per line, as a JSON-encoded
+	// `google.rpc.Status` message.
+	GcsPrefix string `protobuf:"bytes,1,opt,name=gcs_prefix,json=gcsPrefix,proto3,oneof"`
+}
+
+func (*ImportErrorConfig_GcsPrefix) isImportErrorConfig_Destination() {}
+
+// Request message for the ImportUserEvents request.
+type ImportUserEventsRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Required - The desired input source of the user event data.
+	//
+	// Types that are assignable to Source:
+	//
+	//	*ImportUserEventsRequest_InlineSource_
+	//	*ImportUserEventsRequest_GcsSource
+	//	*ImportUserEventsRequest_BigquerySource
+	Source isImportUserEventsRequest_Source `protobuf_oneof:"source"`
+	// Required. Parent DataStore resource name, of the form
+	// `projects/{project}/locations/{location}/collections/{collection}/dataStores/{data_store}`
+	Parent string `protobuf:"bytes,1,opt,name=parent,proto3" json:"parent,omitempty"`
+	// The desired location of errors incurred during the Import. Cannot be set
+	// for inline user event imports.
+	ErrorConfig *ImportErrorConfig `protobuf:"bytes,5,opt,name=error_config,json=errorConfig,proto3" json:"error_config,omitempty"`
+}
+
+func (x *ImportUserEventsRequest) Reset() {
+	*x = ImportUserEventsRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[9]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ImportUserEventsRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ImportUserEventsRequest) ProtoMessage() {}
+
+func (x *ImportUserEventsRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[9]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ImportUserEventsRequest.ProtoReflect.Descriptor instead.
+func (*ImportUserEventsRequest) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{9}
+}
+
+func (m *ImportUserEventsRequest) GetSource() isImportUserEventsRequest_Source {
+	if m != nil {
+		return m.Source
+	}
+	return nil
+}
+
+func (x *ImportUserEventsRequest) GetInlineSource() *ImportUserEventsRequest_InlineSource {
+	if x, ok := x.GetSource().(*ImportUserEventsRequest_InlineSource_); ok {
+		return x.InlineSource
+	}
+	return nil
+}
+
+func (x *ImportUserEventsRequest) GetGcsSource() *GcsSource {
+	if x, ok := x.GetSource().(*ImportUserEventsRequest_GcsSource); ok {
+		return x.GcsSource
+	}
+	return nil
+}
+
+func (x *ImportUserEventsRequest) GetBigquerySource() *BigQuerySource {
+	if x, ok := x.GetSource().(*ImportUserEventsRequest_BigquerySource); ok {
+		return x.BigquerySource
+	}
+	return nil
+}
+
+func (x *ImportUserEventsRequest) GetParent() string {
+	if x != nil {
+		return x.Parent
+	}
+	return ""
+}
+
+func (x *ImportUserEventsRequest) GetErrorConfig() *ImportErrorConfig {
+	if x != nil {
+		return x.ErrorConfig
+	}
+	return nil
+}
+
+type isImportUserEventsRequest_Source interface {
+	isImportUserEventsRequest_Source()
+}
+
+type ImportUserEventsRequest_InlineSource_ struct {
+	// The Inline source for the input content for UserEvents.
+	InlineSource *ImportUserEventsRequest_InlineSource `protobuf:"bytes,2,opt,name=inline_source,json=inlineSource,proto3,oneof"`
+}
+
+type ImportUserEventsRequest_GcsSource struct {
+	// Cloud Storage location for the input content.
+	GcsSource *GcsSource `protobuf:"bytes,3,opt,name=gcs_source,json=gcsSource,proto3,oneof"`
+}
+
+type ImportUserEventsRequest_BigquerySource struct {
+	// BigQuery input source.
+	BigquerySource *BigQuerySource `protobuf:"bytes,4,opt,name=bigquery_source,json=bigquerySource,proto3,oneof"`
+}
+
+func (*ImportUserEventsRequest_InlineSource_) isImportUserEventsRequest_Source() {}
+
+func (*ImportUserEventsRequest_GcsSource) isImportUserEventsRequest_Source() {}
+
+func (*ImportUserEventsRequest_BigquerySource) isImportUserEventsRequest_Source() {}
+
+// Response of the ImportUserEventsRequest. If the long running
+// operation was successful, then this message is returned by the
+// google.longrunning.Operations.response field if the operation was successful.
+type ImportUserEventsResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// A sample of errors encountered while processing the request.
+	ErrorSamples []*status.Status `protobuf:"bytes,1,rep,name=error_samples,json=errorSamples,proto3" json:"error_samples,omitempty"`
+	// Echoes the destination for the complete errors if this field was set in
+	// the request.
+	ErrorConfig *ImportErrorConfig `protobuf:"bytes,2,opt,name=error_config,json=errorConfig,proto3" json:"error_config,omitempty"`
+	// Count of user events imported with complete existing Documents.
+	JoinedEventsCount int64 `protobuf:"varint,3,opt,name=joined_events_count,json=joinedEventsCount,proto3" json:"joined_events_count,omitempty"`
+	// Count of user events imported, but with Document information not found
+	// in the existing Branch.
+	UnjoinedEventsCount int64 `protobuf:"varint,4,opt,name=unjoined_events_count,json=unjoinedEventsCount,proto3" json:"unjoined_events_count,omitempty"`
+}
+
+func (x *ImportUserEventsResponse) Reset() {
+	*x = ImportUserEventsResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[10]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ImportUserEventsResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ImportUserEventsResponse) ProtoMessage() {}
+
+func (x *ImportUserEventsResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[10]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ImportUserEventsResponse.ProtoReflect.Descriptor instead.
+func (*ImportUserEventsResponse) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{10}
+}
+
+func (x *ImportUserEventsResponse) GetErrorSamples() []*status.Status {
+	if x != nil {
+		return x.ErrorSamples
+	}
+	return nil
+}
+
+func (x *ImportUserEventsResponse) GetErrorConfig() *ImportErrorConfig {
+	if x != nil {
+		return x.ErrorConfig
+	}
+	return nil
+}
+
+func (x *ImportUserEventsResponse) GetJoinedEventsCount() int64 {
+	if x != nil {
+		return x.JoinedEventsCount
+	}
+	return 0
+}
+
+func (x *ImportUserEventsResponse) GetUnjoinedEventsCount() int64 {
+	if x != nil {
+		return x.UnjoinedEventsCount
+	}
+	return 0
+}
+
+// Metadata related to the progress of the Import operation. This is
+// returned by the google.longrunning.Operation.metadata field.
+type ImportUserEventsMetadata struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Operation create time.
+	CreateTime *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=create_time,json=createTime,proto3" json:"create_time,omitempty"`
+	// Operation last update time. If the operation is done, this is also the
+	// finish time.
+	UpdateTime *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=update_time,json=updateTime,proto3" json:"update_time,omitempty"`
+	// Count of entries that were processed successfully.
+	SuccessCount int64 `protobuf:"varint,3,opt,name=success_count,json=successCount,proto3" json:"success_count,omitempty"`
+	// Count of entries that encountered errors while processing.
+	FailureCount int64 `protobuf:"varint,4,opt,name=failure_count,json=failureCount,proto3" json:"failure_count,omitempty"`
+}
+
+func (x *ImportUserEventsMetadata) Reset() {
+	*x = ImportUserEventsMetadata{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[11]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ImportUserEventsMetadata) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ImportUserEventsMetadata) ProtoMessage() {}
+
+func (x *ImportUserEventsMetadata) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[11]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ImportUserEventsMetadata.ProtoReflect.Descriptor instead.
+func (*ImportUserEventsMetadata) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{11}
+}
+
+func (x *ImportUserEventsMetadata) GetCreateTime() *timestamppb.Timestamp {
+	if x != nil {
+		return x.CreateTime
+	}
+	return nil
+}
+
+func (x *ImportUserEventsMetadata) GetUpdateTime() *timestamppb.Timestamp {
+	if x != nil {
+		return x.UpdateTime
+	}
+	return nil
+}
+
+func (x *ImportUserEventsMetadata) GetSuccessCount() int64 {
+	if x != nil {
 		return x.SuccessCount
 	}
 	return 0
@@ -697,12 +1311,14 @@ type ImportDocumentsMetadata struct {
 	SuccessCount int64 `protobuf:"varint,3,opt,name=success_count,json=successCount,proto3" json:"success_count,omitempty"`
 	// Count of entries that encountered errors while processing.
 	FailureCount int64 `protobuf:"varint,4,opt,name=failure_count,json=failureCount,proto3" json:"failure_count,omitempty"`
+	// Total count of entries that were processed.
+	TotalCount int64 `protobuf:"varint,5,opt,name=total_count,json=totalCount,proto3" json:"total_count,omitempty"`
 }
 
 func (x *ImportDocumentsMetadata) Reset() {
 	*x = ImportDocumentsMetadata{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[6]
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -715,7 +1331,7 @@ func (x *ImportDocumentsMetadata) String() string {
 func (*ImportDocumentsMetadata) ProtoMessage() {}
 
 func (x *ImportDocumentsMetadata) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[6]
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -728,7 +1344,7 @@ func (x *ImportDocumentsMetadata) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ImportDocumentsMetadata.ProtoReflect.Descriptor instead.
 func (*ImportDocumentsMetadata) Descriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{6}
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *ImportDocumentsMetadata) GetCreateTime() *timestamppb.Timestamp {
@@ -759,6 +1375,13 @@ func (x *ImportDocumentsMetadata) GetFailureCount() int64 {
 	return 0
 }
 
+func (x *ImportDocumentsMetadata) GetTotalCount() int64 {
+	if x != nil {
+		return x.TotalCount
+	}
+	return 0
+}
+
 // Request message for Import methods.
 type ImportDocumentsRequest struct {
 	state         protoimpl.MessageState
@@ -772,6 +1395,11 @@ type ImportDocumentsRequest struct {
 	//	*ImportDocumentsRequest_InlineSource_
 	//	*ImportDocumentsRequest_GcsSource
 	//	*ImportDocumentsRequest_BigquerySource
+	//	*ImportDocumentsRequest_FhirStoreSource
+	//	*ImportDocumentsRequest_SpannerSource
+	//	*ImportDocumentsRequest_CloudSqlSource
+	//	*ImportDocumentsRequest_FirestoreSource
+	//	*ImportDocumentsRequest_BigtableSource
 	Source isImportDocumentsRequest_Source `protobuf_oneof:"source"`
 	// Required. The parent branch resource name, such as
 	// `projects/{project}/locations/{location}/collections/{collection}/dataStores/{data_store}/branches/{branch}`.
@@ -783,6 +1411,9 @@ type ImportDocumentsRequest struct {
 	// be imported. Defaults to
 	// [ReconciliationMode.INCREMENTAL][google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.ReconciliationMode.INCREMENTAL].
 	ReconciliationMode ImportDocumentsRequest_ReconciliationMode `protobuf:"varint,6,opt,name=reconciliation_mode,json=reconciliationMode,proto3,enum=google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest_ReconciliationMode" json:"reconciliation_mode,omitempty"`
+	// Indicates which fields in the provided imported documents to update. If
+	// not set, the default is to update all fields.
+	UpdateMask *fieldmaskpb.FieldMask `protobuf:"bytes,7,opt,name=update_mask,json=updateMask,proto3" json:"update_mask,omitempty"`
 	// Whether to automatically generate IDs for the documents if absent.
 	//
 	// If set to `true`,
@@ -796,51 +1427,60 @@ type ImportDocumentsRequest struct {
 	// [id_field][google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.id_field],
 	// otherwise, documents without IDs fail to be imported.
 	//
-	// Only set this field when using
-	// [GcsSource][google.cloud.discoveryengine.v1alpha.GcsSource] or
-	// [BigQuerySource][google.cloud.discoveryengine.v1alpha.BigQuerySource], and
-	// when
+	// Supported data sources:
+	//
+	// * [GcsSource][google.cloud.discoveryengine.v1alpha.GcsSource].
 	// [GcsSource.data_schema][google.cloud.discoveryengine.v1alpha.GcsSource.data_schema]
-	// or
+	// must be `custom` or `csv`. Otherwise, an INVALID_ARGUMENT error is thrown.
+	// * [BigQuerySource][google.cloud.discoveryengine.v1alpha.BigQuerySource].
 	// [BigQuerySource.data_schema][google.cloud.discoveryengine.v1alpha.BigQuerySource.data_schema]
-	// is `custom` or `csv`. Otherwise, an INVALID_ARGUMENT error is thrown.
+	// must be `custom` or `csv`. Otherwise, an INVALID_ARGUMENT error is thrown.
+	// * [SpannerSource][google.cloud.discoveryengine.v1alpha.SpannerSource].
+	// * [CloudSqlSource][google.cloud.discoveryengine.v1alpha.CloudSqlSource].
+	// * [FirestoreSource][google.cloud.discoveryengine.v1alpha.FirestoreSource].
+	// * [BigtableSource][google.cloud.discoveryengine.v1alpha.BigtableSource].
 	AutoGenerateIds bool `protobuf:"varint,8,opt,name=auto_generate_ids,json=autoGenerateIds,proto3" json:"auto_generate_ids,omitempty"`
-	// The field in the Cloud Storage and BigQuery sources that indicates the
-	// unique IDs of the documents.
+	// The field indicates the ID field or column to be used as unique IDs of
+	// the documents.
 	//
 	// For [GcsSource][google.cloud.discoveryengine.v1alpha.GcsSource] it is the
 	// key of the JSON field. For instance, `my_id` for JSON `{"my_id":
-	// "some_uuid"}`. For
-	// [BigQuerySource][google.cloud.discoveryengine.v1alpha.BigQuerySource] it is
-	// the column name of the BigQuery table where the unique ids are stored.
+	// "some_uuid"}`. For others, it may be the column name of the table where the
+	// unique ids are stored.
 	//
-	// The values of the JSON field or the BigQuery column are used as the
+	// The values of the JSON field or the table column are used as the
 	// [Document.id][google.cloud.discoveryengine.v1alpha.Document.id]s. The JSON
-	// field or the BigQuery column must be of string type, and the values must be
+	// field or the table column must be of string type, and the values must be
 	// set as valid strings conform to
 	// [RFC-1034](https://tools.ietf.org/html/rfc1034) with 1-63 characters.
 	// Otherwise, documents without valid IDs fail to be imported.
 	//
-	// Only set this field when using
-	// [GcsSource][google.cloud.discoveryengine.v1alpha.GcsSource] or
-	// [BigQuerySource][google.cloud.discoveryengine.v1alpha.BigQuerySource], and
-	// when
-	// [GcsSource.data_schema][google.cloud.discoveryengine.v1alpha.GcsSource.data_schema]
-	// or
-	// [BigQuerySource.data_schema][google.cloud.discoveryengine.v1alpha.BigQuerySource.data_schema]
-	// is `custom`. And only set this field when
+	// Only set this field when
 	// [auto_generate_ids][google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.auto_generate_ids]
 	// is unset or set as `false`. Otherwise, an INVALID_ARGUMENT error is thrown.
 	//
 	// If it is unset, a default value `_id` is used when importing from the
 	// allowed data sources.
+	//
+	// Supported data sources:
+	//
+	// * [GcsSource][google.cloud.discoveryengine.v1alpha.GcsSource].
+	// [GcsSource.data_schema][google.cloud.discoveryengine.v1alpha.GcsSource.data_schema]
+	// must be `custom` or `csv`. Otherwise, an INVALID_ARGUMENT error is thrown.
+	// * [BigQuerySource][google.cloud.discoveryengine.v1alpha.BigQuerySource].
+	// [BigQuerySource.data_schema][google.cloud.discoveryengine.v1alpha.BigQuerySource.data_schema]
+	// must be `custom` or `csv`. Otherwise, an INVALID_ARGUMENT error is thrown.
+	// * [SpannerSource][google.cloud.discoveryengine.v1alpha.SpannerSource].
+	// * [CloudSqlSource][google.cloud.discoveryengine.v1alpha.CloudSqlSource].
+	// * [FirestoreSource][google.cloud.discoveryengine.v1alpha.FirestoreSource].
+	// * [BigtableSource][google.cloud.discoveryengine.v1alpha.BigtableSource].
 	IdField string `protobuf:"bytes,9,opt,name=id_field,json=idField,proto3" json:"id_field,omitempty"`
 }
 
 func (x *ImportDocumentsRequest) Reset() {
 	*x = ImportDocumentsRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[7]
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -853,7 +1493,7 @@ func (x *ImportDocumentsRequest) String() string {
 func (*ImportDocumentsRequest) ProtoMessage() {}
 
 func (x *ImportDocumentsRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[7]
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -866,7 +1506,7 @@ func (x *ImportDocumentsRequest) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ImportDocumentsRequest.ProtoReflect.Descriptor instead.
 func (*ImportDocumentsRequest) Descriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{7}
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{13}
 }
 
 func (m *ImportDocumentsRequest) GetSource() isImportDocumentsRequest_Source {
@@ -897,6 +1537,41 @@ func (x *ImportDocumentsRequest) GetBigquerySource() *BigQuerySource {
 	return nil
 }
 
+func (x *ImportDocumentsRequest) GetFhirStoreSource() *FhirStoreSource {
+	if x, ok := x.GetSource().(*ImportDocumentsRequest_FhirStoreSource); ok {
+		return x.FhirStoreSource
+	}
+	return nil
+}
+
+func (x *ImportDocumentsRequest) GetSpannerSource() *SpannerSource {
+	if x, ok := x.GetSource().(*ImportDocumentsRequest_SpannerSource); ok {
+		return x.SpannerSource
+	}
+	return nil
+}
+
+func (x *ImportDocumentsRequest) GetCloudSqlSource() *CloudSqlSource {
+	if x, ok := x.GetSource().(*ImportDocumentsRequest_CloudSqlSource); ok {
+		return x.CloudSqlSource
+	}
+	return nil
+}
+
+func (x *ImportDocumentsRequest) GetFirestoreSource() *FirestoreSource {
+	if x, ok := x.GetSource().(*ImportDocumentsRequest_FirestoreSource); ok {
+		return x.FirestoreSource
+	}
+	return nil
+}
+
+func (x *ImportDocumentsRequest) GetBigtableSource() *BigtableSource {
+	if x, ok := x.GetSource().(*ImportDocumentsRequest_BigtableSource); ok {
+		return x.BigtableSource
+	}
+	return nil
+}
+
 func (x *ImportDocumentsRequest) GetParent() string {
 	if x != nil {
 		return x.Parent
@@ -918,6 +1593,13 @@ func (x *ImportDocumentsRequest) GetReconciliationMode() ImportDocumentsRequest_
 	return ImportDocumentsRequest_RECONCILIATION_MODE_UNSPECIFIED
 }
 
+func (x *ImportDocumentsRequest) GetUpdateMask() *fieldmaskpb.FieldMask {
+	if x != nil {
+		return x.UpdateMask
+	}
+	return nil
+}
+
 func (x *ImportDocumentsRequest) GetAutoGenerateIds() bool {
 	if x != nil {
 		return x.AutoGenerateIds
@@ -951,12 +1633,47 @@ type ImportDocumentsRequest_BigquerySource struct {
 	BigquerySource *BigQuerySource `protobuf:"bytes,4,opt,name=bigquery_source,json=bigquerySource,proto3,oneof"`
 }
 
+type ImportDocumentsRequest_FhirStoreSource struct {
+	// FhirStore input source.
+	FhirStoreSource *FhirStoreSource `protobuf:"bytes,10,opt,name=fhir_store_source,json=fhirStoreSource,proto3,oneof"`
+}
+
+type ImportDocumentsRequest_SpannerSource struct {
+	// Spanner input source.
+	SpannerSource *SpannerSource `protobuf:"bytes,11,opt,name=spanner_source,json=spannerSource,proto3,oneof"`
+}
+
+type ImportDocumentsRequest_CloudSqlSource struct {
+	// Cloud SQL input source.
+	CloudSqlSource *CloudSqlSource `protobuf:"bytes,12,opt,name=cloud_sql_source,json=cloudSqlSource,proto3,oneof"`
+}
+
+type ImportDocumentsRequest_FirestoreSource struct {
+	// Firestore input source.
+	FirestoreSource *FirestoreSource `protobuf:"bytes,13,opt,name=firestore_source,json=firestoreSource,proto3,oneof"`
+}
+
+type ImportDocumentsRequest_BigtableSource struct {
+	// Cloud Bigtable input source.
+	BigtableSource *BigtableSource `protobuf:"bytes,15,opt,name=bigtable_source,json=bigtableSource,proto3,oneof"`
+}
+
 func (*ImportDocumentsRequest_InlineSource_) isImportDocumentsRequest_Source() {}
 
 func (*ImportDocumentsRequest_GcsSource) isImportDocumentsRequest_Source() {}
 
 func (*ImportDocumentsRequest_BigquerySource) isImportDocumentsRequest_Source() {}
 
+func (*ImportDocumentsRequest_FhirStoreSource) isImportDocumentsRequest_Source() {}
+
+func (*ImportDocumentsRequest_SpannerSource) isImportDocumentsRequest_Source() {}
+
+func (*ImportDocumentsRequest_CloudSqlSource) isImportDocumentsRequest_Source() {}
+
+func (*ImportDocumentsRequest_FirestoreSource) isImportDocumentsRequest_Source() {}
+
+func (*ImportDocumentsRequest_BigtableSource) isImportDocumentsRequest_Source() {}
+
 // Response of the
 // [ImportDocumentsRequest][google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest].
 // If the long running operation is done, then this message is returned by the
@@ -975,7 +1692,7 @@ type ImportDocumentsResponse struct {
 func (x *ImportDocumentsResponse) Reset() {
 	*x = ImportDocumentsResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[8]
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -988,7 +1705,7 @@ func (x *ImportDocumentsResponse) String() string {
 func (*ImportDocumentsResponse) ProtoMessage() {}
 
 func (x *ImportDocumentsResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[8]
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1001,7 +1718,7 @@ func (x *ImportDocumentsResponse) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ImportDocumentsResponse.ProtoReflect.Descriptor instead.
 func (*ImportDocumentsResponse) Descriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{8}
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{14}
 }
 
 func (x *ImportDocumentsResponse) GetErrorSamples() []*status.Status {
@@ -1041,7 +1758,7 @@ type ImportSuggestionDenyListEntriesRequest struct {
 func (x *ImportSuggestionDenyListEntriesRequest) Reset() {
 	*x = ImportSuggestionDenyListEntriesRequest{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[9]
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1054,7 +1771,7 @@ func (x *ImportSuggestionDenyListEntriesRequest) String() string {
 func (*ImportSuggestionDenyListEntriesRequest) ProtoMessage() {}
 
 func (x *ImportSuggestionDenyListEntriesRequest) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[9]
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1067,7 +1784,7 @@ func (x *ImportSuggestionDenyListEntriesRequest) ProtoReflect() protoreflect.Mes
 
 // Deprecated: Use ImportSuggestionDenyListEntriesRequest.ProtoReflect.Descriptor instead.
 func (*ImportSuggestionDenyListEntriesRequest) Descriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{9}
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{15}
 }
 
 func (m *ImportSuggestionDenyListEntriesRequest) GetSource() isImportSuggestionDenyListEntriesRequest_Source {
@@ -1144,7 +1861,7 @@ type ImportSuggestionDenyListEntriesResponse struct {
 func (x *ImportSuggestionDenyListEntriesResponse) Reset() {
 	*x = ImportSuggestionDenyListEntriesResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[10]
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1157,7 +1874,286 @@ func (x *ImportSuggestionDenyListEntriesResponse) String() string {
 func (*ImportSuggestionDenyListEntriesResponse) ProtoMessage() {}
 
 func (x *ImportSuggestionDenyListEntriesResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[10]
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[16]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ImportSuggestionDenyListEntriesResponse.ProtoReflect.Descriptor instead.
+func (*ImportSuggestionDenyListEntriesResponse) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{16}
+}
+
+func (x *ImportSuggestionDenyListEntriesResponse) GetErrorSamples() []*status.Status {
+	if x != nil {
+		return x.ErrorSamples
+	}
+	return nil
+}
+
+func (x *ImportSuggestionDenyListEntriesResponse) GetImportedEntriesCount() int64 {
+	if x != nil {
+		return x.ImportedEntriesCount
+	}
+	return 0
+}
+
+func (x *ImportSuggestionDenyListEntriesResponse) GetFailedEntriesCount() int64 {
+	if x != nil {
+		return x.FailedEntriesCount
+	}
+	return 0
+}
+
+// Metadata related to the progress of the ImportSuggestionDenyListEntries
+// operation. This is returned by the google.longrunning.Operation.metadata
+// field.
+type ImportSuggestionDenyListEntriesMetadata struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Operation create time.
+	CreateTime *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=create_time,json=createTime,proto3" json:"create_time,omitempty"`
+	// Operation last update time. If the operation is done, this is also the
+	// finish time.
+	UpdateTime *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=update_time,json=updateTime,proto3" json:"update_time,omitempty"`
+}
+
+func (x *ImportSuggestionDenyListEntriesMetadata) Reset() {
+	*x = ImportSuggestionDenyListEntriesMetadata{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[17]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ImportSuggestionDenyListEntriesMetadata) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ImportSuggestionDenyListEntriesMetadata) ProtoMessage() {}
+
+func (x *ImportSuggestionDenyListEntriesMetadata) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[17]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ImportSuggestionDenyListEntriesMetadata.ProtoReflect.Descriptor instead.
+func (*ImportSuggestionDenyListEntriesMetadata) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{17}
+}
+
+func (x *ImportSuggestionDenyListEntriesMetadata) GetCreateTime() *timestamppb.Timestamp {
+	if x != nil {
+		return x.CreateTime
+	}
+	return nil
+}
+
+func (x *ImportSuggestionDenyListEntriesMetadata) GetUpdateTime() *timestamppb.Timestamp {
+	if x != nil {
+		return x.UpdateTime
+	}
+	return nil
+}
+
+// Response of the
+// [CompletionService.ImportCompletionSuggestions][google.cloud.discoveryengine.v1alpha.CompletionService.ImportCompletionSuggestions]
+// method. If the long running operation is done, this message is returned by
+// the google.longrunning.Operations.response field if the operation is
+// successful.
+type ImportCompletionSuggestionsResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// A sample of errors encountered while processing the request.
+	ErrorSamples []*status.Status `protobuf:"bytes,1,rep,name=error_samples,json=errorSamples,proto3" json:"error_samples,omitempty"`
+	// Count of
+	// [CompletionSuggestion][google.cloud.discoveryengine.v1alpha.CompletionSuggestion]s
+	// successfully imported.
+	SuccessCount int64 `protobuf:"varint,2,opt,name=success_count,json=successCount,proto3" json:"success_count,omitempty"`
+	// Count of
+	// [CompletionSuggestion][google.cloud.discoveryengine.v1alpha.CompletionSuggestion]s
+	// that failed to be imported.
+	FailureCount int64 `protobuf:"varint,3,opt,name=failure_count,json=failureCount,proto3" json:"failure_count,omitempty"`
+}
+
+func (x *ImportCompletionSuggestionsResponse) Reset() {
+	*x = ImportCompletionSuggestionsResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[18]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ImportCompletionSuggestionsResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ImportCompletionSuggestionsResponse) ProtoMessage() {}
+
+func (x *ImportCompletionSuggestionsResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[18]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ImportCompletionSuggestionsResponse.ProtoReflect.Descriptor instead.
+func (*ImportCompletionSuggestionsResponse) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{18}
+}
+
+func (x *ImportCompletionSuggestionsResponse) GetErrorSamples() []*status.Status {
+	if x != nil {
+		return x.ErrorSamples
+	}
+	return nil
+}
+
+func (x *ImportCompletionSuggestionsResponse) GetSuccessCount() int64 {
+	if x != nil {
+		return x.SuccessCount
+	}
+	return 0
+}
+
+func (x *ImportCompletionSuggestionsResponse) GetFailureCount() int64 {
+	if x != nil {
+		return x.FailureCount
+	}
+	return 0
+}
+
+// Metadata related to the progress of the ImportCompletionSuggestions
+// operation. This will be returned by the google.longrunning.Operation.metadata
+// field.
+type ImportCompletionSuggestionsMetadata struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Operation create time.
+	CreateTime *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=create_time,json=createTime,proto3" json:"create_time,omitempty"`
+	// Operation last update time. If the operation is done, this is also the
+	// finish time.
+	UpdateTime *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=update_time,json=updateTime,proto3" json:"update_time,omitempty"`
+}
+
+func (x *ImportCompletionSuggestionsMetadata) Reset() {
+	*x = ImportCompletionSuggestionsMetadata{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[19]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ImportCompletionSuggestionsMetadata) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ImportCompletionSuggestionsMetadata) ProtoMessage() {}
+
+func (x *ImportCompletionSuggestionsMetadata) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[19]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ImportCompletionSuggestionsMetadata.ProtoReflect.Descriptor instead.
+func (*ImportCompletionSuggestionsMetadata) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{19}
+}
+
+func (x *ImportCompletionSuggestionsMetadata) GetCreateTime() *timestamppb.Timestamp {
+	if x != nil {
+		return x.CreateTime
+	}
+	return nil
+}
+
+func (x *ImportCompletionSuggestionsMetadata) GetUpdateTime() *timestamppb.Timestamp {
+	if x != nil {
+		return x.UpdateTime
+	}
+	return nil
+}
+
+// The column family of the Bigtable.
+type BigtableOptions_BigtableColumnFamily struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The field name to use for this column family in the document. The
+	// name has to match the pattern `[a-zA-Z0-9][a-zA-Z0-9-_]*`. If not set,
+	// it is parsed from the family name with best effort. However, due to
+	// different naming patterns, field name collisions could happen, where
+	// parsing behavior is undefined.
+	FieldName string `protobuf:"bytes,1,opt,name=field_name,json=fieldName,proto3" json:"field_name,omitempty"`
+	// The encoding mode of the values when the type is not STRING.
+	// Acceptable encoding values are:
+	//
+	// * `TEXT`: indicates values are alphanumeric text strings.
+	// * `BINARY`: indicates values are encoded using `HBase Bytes.toBytes`
+	// family of functions. This can be overridden for a specific column
+	// by listing that column in `columns` and specifying an encoding for it.
+	Encoding BigtableOptions_Encoding `protobuf:"varint,2,opt,name=encoding,proto3,enum=google.cloud.discoveryengine.v1alpha.BigtableOptions_Encoding" json:"encoding,omitempty"`
+	// The type of values in this column family.
+	// The values are expected to be encoded using `HBase Bytes.toBytes`
+	// function when the encoding value is set to `BINARY`.
+	Type BigtableOptions_Type `protobuf:"varint,3,opt,name=type,proto3,enum=google.cloud.discoveryengine.v1alpha.BigtableOptions_Type" json:"type,omitempty"`
+	// The list of objects that contains column level information for each
+	// column. If a column is not present in this list it will be ignored.
+	Columns []*BigtableOptions_BigtableColumn `protobuf:"bytes,4,rep,name=columns,proto3" json:"columns,omitempty"`
+}
+
+func (x *BigtableOptions_BigtableColumnFamily) Reset() {
+	*x = BigtableOptions_BigtableColumnFamily{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[20]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *BigtableOptions_BigtableColumnFamily) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*BigtableOptions_BigtableColumnFamily) ProtoMessage() {}
+
+func (x *BigtableOptions_BigtableColumnFamily) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[20]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1168,64 +2164,85 @@ func (x *ImportSuggestionDenyListEntriesResponse) ProtoReflect() protoreflect.Me
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use ImportSuggestionDenyListEntriesResponse.ProtoReflect.Descriptor instead.
-func (*ImportSuggestionDenyListEntriesResponse) Descriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{10}
+// Deprecated: Use BigtableOptions_BigtableColumnFamily.ProtoReflect.Descriptor instead.
+func (*BigtableOptions_BigtableColumnFamily) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{3, 0}
 }
 
-func (x *ImportSuggestionDenyListEntriesResponse) GetErrorSamples() []*status.Status {
+func (x *BigtableOptions_BigtableColumnFamily) GetFieldName() string {
 	if x != nil {
-		return x.ErrorSamples
+		return x.FieldName
 	}
-	return nil
+	return ""
 }
 
-func (x *ImportSuggestionDenyListEntriesResponse) GetImportedEntriesCount() int64 {
+func (x *BigtableOptions_BigtableColumnFamily) GetEncoding() BigtableOptions_Encoding {
 	if x != nil {
-		return x.ImportedEntriesCount
+		return x.Encoding
 	}
-	return 0
+	return BigtableOptions_ENCODING_UNSPECIFIED
 }
 
-func (x *ImportSuggestionDenyListEntriesResponse) GetFailedEntriesCount() int64 {
+func (x *BigtableOptions_BigtableColumnFamily) GetType() BigtableOptions_Type {
 	if x != nil {
-		return x.FailedEntriesCount
+		return x.Type
 	}
-	return 0
+	return BigtableOptions_TYPE_UNSPECIFIED
 }
 
-// Metadata related to the progress of the ImportSuggestionDenyListEntries
-// operation. This is returned by the google.longrunning.Operation.metadata
-// field.
-type ImportSuggestionDenyListEntriesMetadata struct {
+func (x *BigtableOptions_BigtableColumnFamily) GetColumns() []*BigtableOptions_BigtableColumn {
+	if x != nil {
+		return x.Columns
+	}
+	return nil
+}
+
+// The column of the Bigtable.
+type BigtableOptions_BigtableColumn struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// Operation create time.
-	CreateTime *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=create_time,json=createTime,proto3" json:"create_time,omitempty"`
-	// Operation last update time. If the operation is done, this is also the
-	// finish time.
-	UpdateTime *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=update_time,json=updateTime,proto3" json:"update_time,omitempty"`
-}
-
-func (x *ImportSuggestionDenyListEntriesMetadata) Reset() {
-	*x = ImportSuggestionDenyListEntriesMetadata{}
+	// Required. Qualifier of the column. If it cannot be decoded with utf-8,
+	// use a base-64 encoded string instead.
+	Qualifier []byte `protobuf:"bytes,1,opt,name=qualifier,proto3" json:"qualifier,omitempty"`
+	// The field name to use for this column in the document. The name has to
+	// match the pattern `[a-zA-Z0-9][a-zA-Z0-9-_]*`.
+	// If not set, it is parsed from the qualifier bytes with best effort.
+	// However, due to different naming patterns, field name collisions could
+	// happen, where parsing behavior is undefined.
+	FieldName string `protobuf:"bytes,2,opt,name=field_name,json=fieldName,proto3" json:"field_name,omitempty"`
+	// The encoding mode of the values when the type is not `STRING`.
+	// Acceptable encoding values are:
+	//
+	// * `TEXT`: indicates values are alphanumeric text strings.
+	// * `BINARY`: indicates values are encoded using `HBase Bytes.toBytes`
+	// family of functions. This can be overridden for a specific column
+	// by listing that column in `columns` and specifying an encoding for it.
+	Encoding BigtableOptions_Encoding `protobuf:"varint,3,opt,name=encoding,proto3,enum=google.cloud.discoveryengine.v1alpha.BigtableOptions_Encoding" json:"encoding,omitempty"`
+	// The type of values in this column family.
+	// The values are expected to be encoded using `HBase Bytes.toBytes`
+	// function when the encoding value is set to `BINARY`.
+	Type BigtableOptions_Type `protobuf:"varint,4,opt,name=type,proto3,enum=google.cloud.discoveryengine.v1alpha.BigtableOptions_Type" json:"type,omitempty"`
+}
+
+func (x *BigtableOptions_BigtableColumn) Reset() {
+	*x = BigtableOptions_BigtableColumn{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[11]
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[21]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
 }
 
-func (x *ImportSuggestionDenyListEntriesMetadata) String() string {
+func (x *BigtableOptions_BigtableColumn) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*ImportSuggestionDenyListEntriesMetadata) ProtoMessage() {}
+func (*BigtableOptions_BigtableColumn) ProtoMessage() {}
 
-func (x *ImportSuggestionDenyListEntriesMetadata) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[11]
+func (x *BigtableOptions_BigtableColumn) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[21]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1236,23 +2253,37 @@ func (x *ImportSuggestionDenyListEntriesMetadata) ProtoReflect() protoreflect.Me
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use ImportSuggestionDenyListEntriesMetadata.ProtoReflect.Descriptor instead.
-func (*ImportSuggestionDenyListEntriesMetadata) Descriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{11}
+// Deprecated: Use BigtableOptions_BigtableColumn.ProtoReflect.Descriptor instead.
+func (*BigtableOptions_BigtableColumn) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{3, 1}
 }
 
-func (x *ImportSuggestionDenyListEntriesMetadata) GetCreateTime() *timestamppb.Timestamp {
+func (x *BigtableOptions_BigtableColumn) GetQualifier() []byte {
 	if x != nil {
-		return x.CreateTime
+		return x.Qualifier
 	}
 	return nil
 }
 
-func (x *ImportSuggestionDenyListEntriesMetadata) GetUpdateTime() *timestamppb.Timestamp {
+func (x *BigtableOptions_BigtableColumn) GetFieldName() string {
 	if x != nil {
-		return x.UpdateTime
+		return x.FieldName
 	}
-	return nil
+	return ""
+}
+
+func (x *BigtableOptions_BigtableColumn) GetEncoding() BigtableOptions_Encoding {
+	if x != nil {
+		return x.Encoding
+	}
+	return BigtableOptions_ENCODING_UNSPECIFIED
+}
+
+func (x *BigtableOptions_BigtableColumn) GetType() BigtableOptions_Type {
+	if x != nil {
+		return x.Type
+	}
+	return BigtableOptions_TYPE_UNSPECIFIED
 }
 
 // The inline source for the input config for ImportUserEvents method.
@@ -1268,7 +2299,7 @@ type ImportUserEventsRequest_InlineSource struct {
 func (x *ImportUserEventsRequest_InlineSource) Reset() {
 	*x = ImportUserEventsRequest_InlineSource{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[12]
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[23]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1281,7 +2312,7 @@ func (x *ImportUserEventsRequest_InlineSource) String() string {
 func (*ImportUserEventsRequest_InlineSource) ProtoMessage() {}
 
 func (x *ImportUserEventsRequest_InlineSource) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[12]
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[23]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1294,7 +2325,7 @@ func (x *ImportUserEventsRequest_InlineSource) ProtoReflect() protoreflect.Messa
 
 // Deprecated: Use ImportUserEventsRequest_InlineSource.ProtoReflect.Descriptor instead.
 func (*ImportUserEventsRequest_InlineSource) Descriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{3, 0}
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{9, 0}
 }
 
 func (x *ImportUserEventsRequest_InlineSource) GetUserEvents() []*UserEvent {
@@ -1319,7 +2350,7 @@ type ImportDocumentsRequest_InlineSource struct {
 func (x *ImportDocumentsRequest_InlineSource) Reset() {
 	*x = ImportDocumentsRequest_InlineSource{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[13]
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[24]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1332,7 +2363,7 @@ func (x *ImportDocumentsRequest_InlineSource) String() string {
 func (*ImportDocumentsRequest_InlineSource) ProtoMessage() {}
 
 func (x *ImportDocumentsRequest_InlineSource) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[13]
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[24]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1345,7 +2376,7 @@ func (x *ImportDocumentsRequest_InlineSource) ProtoReflect() protoreflect.Messag
 
 // Deprecated: Use ImportDocumentsRequest_InlineSource.ProtoReflect.Descriptor instead.
 func (*ImportDocumentsRequest_InlineSource) Descriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{7, 0}
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{13, 0}
 }
 
 func (x *ImportDocumentsRequest_InlineSource) GetDocuments() []*Document {
@@ -1368,7 +2399,7 @@ type ImportSuggestionDenyListEntriesRequest_InlineSource struct {
 func (x *ImportSuggestionDenyListEntriesRequest_InlineSource) Reset() {
 	*x = ImportSuggestionDenyListEntriesRequest_InlineSource{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[14]
+		mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[25]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1381,7 +2412,7 @@ func (x *ImportSuggestionDenyListEntriesRequest_InlineSource) String() string {
 func (*ImportSuggestionDenyListEntriesRequest_InlineSource) ProtoMessage() {}
 
 func (x *ImportSuggestionDenyListEntriesRequest_InlineSource) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[14]
+	mi := &file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[25]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1394,7 +2425,7 @@ func (x *ImportSuggestionDenyListEntriesRequest_InlineSource) ProtoReflect() pro
 
 // Deprecated: Use ImportSuggestionDenyListEntriesRequest_InlineSource.ProtoReflect.Descriptor instead.
 func (*ImportSuggestionDenyListEntriesRequest_InlineSource) Descriptor() ([]byte, []int) {
-	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{9, 0}
+	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP(), []int{15, 0}
 }
 
 func (x *ImportSuggestionDenyListEntriesRequest_InlineSource) GetEntries() []*SuggestionDenyListEntry {
@@ -1427,121 +2458,251 @@ var file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDesc = []by
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+	0x6c, 0x65, 0x5c, 0x43, 0x6c, 0x6f, 0x75, 0x64, 0x5c, 0x44, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65,
+	0x72, 0x79, 0x45, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x5c, 0x56, 0x31, 0x61, 0x6c, 0x70, 0x68, 0x61,
+	0xea, 0x02, 0x27, 0x47, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x3a, 0x3a, 0x43, 0x6c, 0x6f, 0x75, 0x64,
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+	0x6f, 0x33,
 }
 
 var (
@@ -1691,64 +2908,95 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescGZIP()
 	return file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDescData
 }
 
-var file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes = make([]protoimpl.MessageInfo, 15)
+var file_google_cloud_discoveryengine_v1alpha_import_config_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
+var file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes = make([]protoimpl.MessageInfo, 26)
 var file_google_cloud_discoveryengine_v1alpha_import_config_proto_goTypes = []interface{}{
-	(ImportDocumentsRequest_ReconciliationMode)(0), // 0: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.ReconciliationMode
-	(*GcsSource)(nil),                                           // 1: google.cloud.discoveryengine.v1alpha.GcsSource
-	(*BigQuerySource)(nil),                                      // 2: google.cloud.discoveryengine.v1alpha.BigQuerySource
-	(*ImportErrorConfig)(nil),                                   // 3: google.cloud.discoveryengine.v1alpha.ImportErrorConfig
-	(*ImportUserEventsRequest)(nil),                             // 4: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest
-	(*ImportUserEventsResponse)(nil),                            // 5: google.cloud.discoveryengine.v1alpha.ImportUserEventsResponse
-	(*ImportUserEventsMetadata)(nil),                            // 6: google.cloud.discoveryengine.v1alpha.ImportUserEventsMetadata
-	(*ImportDocumentsMetadata)(nil),                             // 7: google.cloud.discoveryengine.v1alpha.ImportDocumentsMetadata
-	(*ImportDocumentsRequest)(nil),                              // 8: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest
-	(*ImportDocumentsResponse)(nil),                             // 9: google.cloud.discoveryengine.v1alpha.ImportDocumentsResponse
-	(*ImportSuggestionDenyListEntriesRequest)(nil),              // 10: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest
-	(*ImportSuggestionDenyListEntriesResponse)(nil),             // 11: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesResponse
-	(*ImportSuggestionDenyListEntriesMetadata)(nil),             // 12: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesMetadata
-	(*ImportUserEventsRequest_InlineSource)(nil),                // 13: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.InlineSource
-	(*ImportDocumentsRequest_InlineSource)(nil),                 // 14: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.InlineSource
-	(*ImportSuggestionDenyListEntriesRequest_InlineSource)(nil), // 15: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.InlineSource
-	(*date.Date)(nil),                                           // 16: google.type.Date
-	(*status.Status)(nil),                                       // 17: google.rpc.Status
-	(*timestamppb.Timestamp)(nil),                               // 18: google.protobuf.Timestamp
-	(*UserEvent)(nil),                                           // 19: google.cloud.discoveryengine.v1alpha.UserEvent
-	(*Document)(nil),                                            // 20: google.cloud.discoveryengine.v1alpha.Document
-	(*SuggestionDenyListEntry)(nil),                             // 21: google.cloud.discoveryengine.v1alpha.SuggestionDenyListEntry
+	(BigtableOptions_Type)(0),                                   // 0: google.cloud.discoveryengine.v1alpha.BigtableOptions.Type
+	(BigtableOptions_Encoding)(0),                               // 1: google.cloud.discoveryengine.v1alpha.BigtableOptions.Encoding
+	(ImportDocumentsRequest_ReconciliationMode)(0),              // 2: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.ReconciliationMode
+	(*GcsSource)(nil),                                           // 3: google.cloud.discoveryengine.v1alpha.GcsSource
+	(*BigQuerySource)(nil),                                      // 4: google.cloud.discoveryengine.v1alpha.BigQuerySource
+	(*SpannerSource)(nil),                                       // 5: google.cloud.discoveryengine.v1alpha.SpannerSource
+	(*BigtableOptions)(nil),                                     // 6: google.cloud.discoveryengine.v1alpha.BigtableOptions
+	(*BigtableSource)(nil),                                      // 7: google.cloud.discoveryengine.v1alpha.BigtableSource
+	(*FhirStoreSource)(nil),                                     // 8: google.cloud.discoveryengine.v1alpha.FhirStoreSource
+	(*CloudSqlSource)(nil),                                      // 9: google.cloud.discoveryengine.v1alpha.CloudSqlSource
+	(*FirestoreSource)(nil),                                     // 10: google.cloud.discoveryengine.v1alpha.FirestoreSource
+	(*ImportErrorConfig)(nil),                                   // 11: google.cloud.discoveryengine.v1alpha.ImportErrorConfig
+	(*ImportUserEventsRequest)(nil),                             // 12: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest
+	(*ImportUserEventsResponse)(nil),                            // 13: google.cloud.discoveryengine.v1alpha.ImportUserEventsResponse
+	(*ImportUserEventsMetadata)(nil),                            // 14: google.cloud.discoveryengine.v1alpha.ImportUserEventsMetadata
+	(*ImportDocumentsMetadata)(nil),                             // 15: google.cloud.discoveryengine.v1alpha.ImportDocumentsMetadata
+	(*ImportDocumentsRequest)(nil),                              // 16: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest
+	(*ImportDocumentsResponse)(nil),                             // 17: google.cloud.discoveryengine.v1alpha.ImportDocumentsResponse
+	(*ImportSuggestionDenyListEntriesRequest)(nil),              // 18: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest
+	(*ImportSuggestionDenyListEntriesResponse)(nil),             // 19: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesResponse
+	(*ImportSuggestionDenyListEntriesMetadata)(nil),             // 20: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesMetadata
+	(*ImportCompletionSuggestionsResponse)(nil),                 // 21: google.cloud.discoveryengine.v1alpha.ImportCompletionSuggestionsResponse
+	(*ImportCompletionSuggestionsMetadata)(nil),                 // 22: google.cloud.discoveryengine.v1alpha.ImportCompletionSuggestionsMetadata
+	(*BigtableOptions_BigtableColumnFamily)(nil),                // 23: google.cloud.discoveryengine.v1alpha.BigtableOptions.BigtableColumnFamily
+	(*BigtableOptions_BigtableColumn)(nil),                      // 24: google.cloud.discoveryengine.v1alpha.BigtableOptions.BigtableColumn
+	nil,                                                         // 25: google.cloud.discoveryengine.v1alpha.BigtableOptions.FamiliesEntry
+	(*ImportUserEventsRequest_InlineSource)(nil),                // 26: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.InlineSource
+	(*ImportDocumentsRequest_InlineSource)(nil),                 // 27: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.InlineSource
+	(*ImportSuggestionDenyListEntriesRequest_InlineSource)(nil), // 28: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.InlineSource
+	(*date.Date)(nil),                                           // 29: google.type.Date
+	(*status.Status)(nil),                                       // 30: google.rpc.Status
+	(*timestamppb.Timestamp)(nil),                               // 31: google.protobuf.Timestamp
+	(*fieldmaskpb.FieldMask)(nil),                               // 32: google.protobuf.FieldMask
+	(*UserEvent)(nil),                                           // 33: google.cloud.discoveryengine.v1alpha.UserEvent
+	(*Document)(nil),                                            // 34: google.cloud.discoveryengine.v1alpha.Document
+	(*SuggestionDenyListEntry)(nil),                             // 35: google.cloud.discoveryengine.v1alpha.SuggestionDenyListEntry
 }
 var file_google_cloud_discoveryengine_v1alpha_import_config_proto_depIdxs = []int32{
-	16, // 0: google.cloud.discoveryengine.v1alpha.BigQuerySource.partition_date:type_name -> google.type.Date
-	13, // 1: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.inline_source:type_name -> google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.InlineSource
-	1,  // 2: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.gcs_source:type_name -> google.cloud.discoveryengine.v1alpha.GcsSource
-	2,  // 3: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.bigquery_source:type_name -> google.cloud.discoveryengine.v1alpha.BigQuerySource
-	3,  // 4: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
-	17, // 5: google.cloud.discoveryengine.v1alpha.ImportUserEventsResponse.error_samples:type_name -> google.rpc.Status
-	3,  // 6: google.cloud.discoveryengine.v1alpha.ImportUserEventsResponse.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
-	18, // 7: google.cloud.discoveryengine.v1alpha.ImportUserEventsMetadata.create_time:type_name -> google.protobuf.Timestamp
-	18, // 8: google.cloud.discoveryengine.v1alpha.ImportUserEventsMetadata.update_time:type_name -> google.protobuf.Timestamp
-	18, // 9: google.cloud.discoveryengine.v1alpha.ImportDocumentsMetadata.create_time:type_name -> google.protobuf.Timestamp
-	18, // 10: google.cloud.discoveryengine.v1alpha.ImportDocumentsMetadata.update_time:type_name -> google.protobuf.Timestamp
-	14, // 11: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.inline_source:type_name -> google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.InlineSource
-	1,  // 12: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.gcs_source:type_name -> google.cloud.discoveryengine.v1alpha.GcsSource
-	2,  // 13: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.bigquery_source:type_name -> google.cloud.discoveryengine.v1alpha.BigQuerySource
-	3,  // 14: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
-	0,  // 15: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.reconciliation_mode:type_name -> google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.ReconciliationMode
-	17, // 16: google.cloud.discoveryengine.v1alpha.ImportDocumentsResponse.error_samples:type_name -> google.rpc.Status
-	3,  // 17: google.cloud.discoveryengine.v1alpha.ImportDocumentsResponse.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
-	15, // 18: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.inline_source:type_name -> google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.InlineSource
-	1,  // 19: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.gcs_source:type_name -> google.cloud.discoveryengine.v1alpha.GcsSource
-	17, // 20: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesResponse.error_samples:type_name -> google.rpc.Status
-	18, // 21: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesMetadata.create_time:type_name -> google.protobuf.Timestamp
-	18, // 22: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesMetadata.update_time:type_name -> google.protobuf.Timestamp
-	19, // 23: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.InlineSource.user_events:type_name -> google.cloud.discoveryengine.v1alpha.UserEvent
-	20, // 24: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.InlineSource.documents:type_name -> google.cloud.discoveryengine.v1alpha.Document
-	21, // 25: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.InlineSource.entries:type_name -> google.cloud.discoveryengine.v1alpha.SuggestionDenyListEntry
-	26, // [26:26] is the sub-list for method output_type
-	26, // [26:26] is the sub-list for method input_type
-	26, // [26:26] is the sub-list for extension type_name
-	26, // [26:26] is the sub-list for extension extendee
-	0,  // [0:26] is the sub-list for field type_name
+	29, // 0: google.cloud.discoveryengine.v1alpha.BigQuerySource.partition_date:type_name -> google.type.Date
+	25, // 1: google.cloud.discoveryengine.v1alpha.BigtableOptions.families:type_name -> google.cloud.discoveryengine.v1alpha.BigtableOptions.FamiliesEntry
+	6,  // 2: google.cloud.discoveryengine.v1alpha.BigtableSource.bigtable_options:type_name -> google.cloud.discoveryengine.v1alpha.BigtableOptions
+	26, // 3: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.inline_source:type_name -> google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.InlineSource
+	3,  // 4: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.gcs_source:type_name -> google.cloud.discoveryengine.v1alpha.GcsSource
+	4,  // 5: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.bigquery_source:type_name -> google.cloud.discoveryengine.v1alpha.BigQuerySource
+	11, // 6: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
+	30, // 7: google.cloud.discoveryengine.v1alpha.ImportUserEventsResponse.error_samples:type_name -> google.rpc.Status
+	11, // 8: google.cloud.discoveryengine.v1alpha.ImportUserEventsResponse.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
+	31, // 9: google.cloud.discoveryengine.v1alpha.ImportUserEventsMetadata.create_time:type_name -> google.protobuf.Timestamp
+	31, // 10: google.cloud.discoveryengine.v1alpha.ImportUserEventsMetadata.update_time:type_name -> google.protobuf.Timestamp
+	31, // 11: google.cloud.discoveryengine.v1alpha.ImportDocumentsMetadata.create_time:type_name -> google.protobuf.Timestamp
+	31, // 12: google.cloud.discoveryengine.v1alpha.ImportDocumentsMetadata.update_time:type_name -> google.protobuf.Timestamp
+	27, // 13: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.inline_source:type_name -> google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.InlineSource
+	3,  // 14: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.gcs_source:type_name -> google.cloud.discoveryengine.v1alpha.GcsSource
+	4,  // 15: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.bigquery_source:type_name -> google.cloud.discoveryengine.v1alpha.BigQuerySource
+	8,  // 16: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.fhir_store_source:type_name -> google.cloud.discoveryengine.v1alpha.FhirStoreSource
+	5,  // 17: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.spanner_source:type_name -> google.cloud.discoveryengine.v1alpha.SpannerSource
+	9,  // 18: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.cloud_sql_source:type_name -> google.cloud.discoveryengine.v1alpha.CloudSqlSource
+	10, // 19: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.firestore_source:type_name -> google.cloud.discoveryengine.v1alpha.FirestoreSource
+	7,  // 20: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.bigtable_source:type_name -> google.cloud.discoveryengine.v1alpha.BigtableSource
+	11, // 21: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
+	2,  // 22: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.reconciliation_mode:type_name -> google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.ReconciliationMode
+	32, // 23: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.update_mask:type_name -> google.protobuf.FieldMask
+	30, // 24: google.cloud.discoveryengine.v1alpha.ImportDocumentsResponse.error_samples:type_name -> google.rpc.Status
+	11, // 25: google.cloud.discoveryengine.v1alpha.ImportDocumentsResponse.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
+	28, // 26: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.inline_source:type_name -> google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.InlineSource
+	3,  // 27: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.gcs_source:type_name -> google.cloud.discoveryengine.v1alpha.GcsSource
+	30, // 28: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesResponse.error_samples:type_name -> google.rpc.Status
+	31, // 29: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesMetadata.create_time:type_name -> google.protobuf.Timestamp
+	31, // 30: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesMetadata.update_time:type_name -> google.protobuf.Timestamp
+	30, // 31: google.cloud.discoveryengine.v1alpha.ImportCompletionSuggestionsResponse.error_samples:type_name -> google.rpc.Status
+	31, // 32: google.cloud.discoveryengine.v1alpha.ImportCompletionSuggestionsMetadata.create_time:type_name -> google.protobuf.Timestamp
+	31, // 33: google.cloud.discoveryengine.v1alpha.ImportCompletionSuggestionsMetadata.update_time:type_name -> google.protobuf.Timestamp
+	1,  // 34: google.cloud.discoveryengine.v1alpha.BigtableOptions.BigtableColumnFamily.encoding:type_name -> google.cloud.discoveryengine.v1alpha.BigtableOptions.Encoding
+	0,  // 35: google.cloud.discoveryengine.v1alpha.BigtableOptions.BigtableColumnFamily.type:type_name -> google.cloud.discoveryengine.v1alpha.BigtableOptions.Type
+	24, // 36: google.cloud.discoveryengine.v1alpha.BigtableOptions.BigtableColumnFamily.columns:type_name -> google.cloud.discoveryengine.v1alpha.BigtableOptions.BigtableColumn
+	1,  // 37: google.cloud.discoveryengine.v1alpha.BigtableOptions.BigtableColumn.encoding:type_name -> google.cloud.discoveryengine.v1alpha.BigtableOptions.Encoding
+	0,  // 38: google.cloud.discoveryengine.v1alpha.BigtableOptions.BigtableColumn.type:type_name -> google.cloud.discoveryengine.v1alpha.BigtableOptions.Type
+	23, // 39: google.cloud.discoveryengine.v1alpha.BigtableOptions.FamiliesEntry.value:type_name -> google.cloud.discoveryengine.v1alpha.BigtableOptions.BigtableColumnFamily
+	33, // 40: google.cloud.discoveryengine.v1alpha.ImportUserEventsRequest.InlineSource.user_events:type_name -> google.cloud.discoveryengine.v1alpha.UserEvent
+	34, // 41: google.cloud.discoveryengine.v1alpha.ImportDocumentsRequest.InlineSource.documents:type_name -> google.cloud.discoveryengine.v1alpha.Document
+	35, // 42: google.cloud.discoveryengine.v1alpha.ImportSuggestionDenyListEntriesRequest.InlineSource.entries:type_name -> google.cloud.discoveryengine.v1alpha.SuggestionDenyListEntry
+	43, // [43:43] is the sub-list for method output_type
+	43, // [43:43] is the sub-list for method input_type
+	43, // [43:43] is the sub-list for extension type_name
+	43, // [43:43] is the sub-list for extension extendee
+	0,  // [0:43] is the sub-list for field type_name
 }
 
 func init() { file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() }
@@ -1785,7 +3033,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportErrorConfig); i {
+			switch v := v.(*SpannerSource); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1797,7 +3045,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportUserEventsRequest); i {
+			switch v := v.(*BigtableOptions); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1809,7 +3057,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportUserEventsResponse); i {
+			switch v := v.(*BigtableSource); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1821,7 +3069,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportUserEventsMetadata); i {
+			switch v := v.(*FhirStoreSource); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1833,7 +3081,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportDocumentsMetadata); i {
+			switch v := v.(*CloudSqlSource); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1845,7 +3093,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportDocumentsRequest); i {
+			switch v := v.(*FirestoreSource); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1857,7 +3105,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportDocumentsResponse); i {
+			switch v := v.(*ImportErrorConfig); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1869,7 +3117,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportSuggestionDenyListEntriesRequest); i {
+			switch v := v.(*ImportUserEventsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1881,7 +3129,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportSuggestionDenyListEntriesResponse); i {
+			switch v := v.(*ImportUserEventsResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1893,7 +3141,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportSuggestionDenyListEntriesMetadata); i {
+			switch v := v.(*ImportUserEventsMetadata); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1905,7 +3153,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportUserEventsRequest_InlineSource); i {
+			switch v := v.(*ImportDocumentsMetadata); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1917,7 +3165,7 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ImportDocumentsRequest_InlineSource); i {
+			switch v := v.(*ImportDocumentsRequest); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1929,6 +3177,126 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ImportDocumentsResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ImportSuggestionDenyListEntriesRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ImportSuggestionDenyListEntriesResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ImportSuggestionDenyListEntriesMetadata); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ImportCompletionSuggestionsResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ImportCompletionSuggestionsMetadata); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*BigtableOptions_BigtableColumnFamily); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[21].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*BigtableOptions_BigtableColumn); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[23].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ImportUserEventsRequest_InlineSource); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ImportDocumentsRequest_InlineSource); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ImportSuggestionDenyListEntriesRequest_InlineSource); i {
 			case 0:
 				return &v.state
@@ -1944,20 +3312,25 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 	file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[1].OneofWrappers = []interface{}{
 		(*BigQuerySource_PartitionDate)(nil),
 	}
-	file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[2].OneofWrappers = []interface{}{
+	file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[8].OneofWrappers = []interface{}{
 		(*ImportErrorConfig_GcsPrefix)(nil),
 	}
-	file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[3].OneofWrappers = []interface{}{
+	file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[9].OneofWrappers = []interface{}{
 		(*ImportUserEventsRequest_InlineSource_)(nil),
 		(*ImportUserEventsRequest_GcsSource)(nil),
 		(*ImportUserEventsRequest_BigquerySource)(nil),
 	}
-	file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[7].OneofWrappers = []interface{}{
+	file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[13].OneofWrappers = []interface{}{
 		(*ImportDocumentsRequest_InlineSource_)(nil),
 		(*ImportDocumentsRequest_GcsSource)(nil),
 		(*ImportDocumentsRequest_BigquerySource)(nil),
+		(*ImportDocumentsRequest_FhirStoreSource)(nil),
+		(*ImportDocumentsRequest_SpannerSource)(nil),
+		(*ImportDocumentsRequest_CloudSqlSource)(nil),
+		(*ImportDocumentsRequest_FirestoreSource)(nil),
+		(*ImportDocumentsRequest_BigtableSource)(nil),
 	}
-	file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[9].OneofWrappers = []interface{}{
+	file_google_cloud_discoveryengine_v1alpha_import_config_proto_msgTypes[15].OneofWrappers = []interface{}{
 		(*ImportSuggestionDenyListEntriesRequest_InlineSource_)(nil),
 		(*ImportSuggestionDenyListEntriesRequest_GcsSource)(nil),
 	}
@@ -1966,8 +3339,8 @@ func file_google_cloud_discoveryengine_v1alpha_import_config_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_cloud_discoveryengine_v1alpha_import_config_proto_rawDesc,
-			NumEnums:      1,
-			NumMessages:   15,
+			NumEnums:      3,
+			NumMessages:   26,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/discoveryengine/apiv1alpha/discoveryenginepb/rank_service.pb.go b/discoveryengine/apiv1alpha/discoveryenginepb/rank_service.pb.go
new file mode 100755
index 000000000000..25c557ec14e5
--- /dev/null
+++ b/discoveryengine/apiv1alpha/discoveryenginepb/rank_service.pb.go
@@ -0,0 +1,546 @@
+// Copyright 2022 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.32.0
+// 	protoc        v4.25.2
+// source: google/cloud/discoveryengine/v1alpha/rank_service.proto
+
+package discoveryenginepb
+
+import (
+	context "context"
+	reflect "reflect"
+	sync "sync"
+
+	_ "google.golang.org/genproto/googleapis/api/annotations"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// Record message for
+// [RankService.Rank][google.cloud.discoveryengine.v1alpha.RankService.Rank]
+// method.
+type RankingRecord struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The unique ID to represent the record.
+	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	// The title of the record. Empty by default.
+	// At least one of
+	// [title][google.cloud.discoveryengine.v1alpha.RankingRecord.title] or
+	// [content][google.cloud.discoveryengine.v1alpha.RankingRecord.content]
+	// should be set otherwise an INVALID_ARGUMENT error is thrown.
+	Title string `protobuf:"bytes,2,opt,name=title,proto3" json:"title,omitempty"`
+	// The content of the record. Empty by default.
+	// At least one of
+	// [title][google.cloud.discoveryengine.v1alpha.RankingRecord.title] or
+	// [content][google.cloud.discoveryengine.v1alpha.RankingRecord.content]
+	// should be set otherwise an INVALID_ARGUMENT error is thrown.
+	Content string `protobuf:"bytes,3,opt,name=content,proto3" json:"content,omitempty"`
+	// The score of this record based on the given query and selected model.
+	Score float32 `protobuf:"fixed32,4,opt,name=score,proto3" json:"score,omitempty"`
+}
+
+func (x *RankingRecord) Reset() {
+	*x = RankingRecord{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RankingRecord) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RankingRecord) ProtoMessage() {}
+
+func (x *RankingRecord) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RankingRecord.ProtoReflect.Descriptor instead.
+func (*RankingRecord) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *RankingRecord) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *RankingRecord) GetTitle() string {
+	if x != nil {
+		return x.Title
+	}
+	return ""
+}
+
+func (x *RankingRecord) GetContent() string {
+	if x != nil {
+		return x.Content
+	}
+	return ""
+}
+
+func (x *RankingRecord) GetScore() float32 {
+	if x != nil {
+		return x.Score
+	}
+	return 0
+}
+
+// Request message for
+// [RankService.Rank][google.cloud.discoveryengine.v1alpha.RankService.Rank]
+// method.
+type RankRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Required. The resource name of the rank service config, such as
+	// `projects/{project_num}/locations/{location_id}/rankingConfigs/default_ranking_config`.
+	RankingConfig string `protobuf:"bytes,1,opt,name=ranking_config,json=rankingConfig,proto3" json:"ranking_config,omitempty"`
+	// The identifier of the model to use. It is one of:
+	//
+	// * `semantic-ranker-512@latest`: Semantic ranking model with maxiumn input
+	// token size 512.
+	//
+	// It is set to `semantic-ranker-512@latest` by default if unspecified.
+	Model string `protobuf:"bytes,2,opt,name=model,proto3" json:"model,omitempty"`
+	// The number of results to return. If this is unset or no bigger than zero,
+	// returns all results.
+	TopN int32 `protobuf:"varint,3,opt,name=top_n,json=topN,proto3" json:"top_n,omitempty"`
+	// The query to use.
+	Query string `protobuf:"bytes,4,opt,name=query,proto3" json:"query,omitempty"`
+	// Required. A list of records to rank. At most 200 records to rank.
+	Records []*RankingRecord `protobuf:"bytes,5,rep,name=records,proto3" json:"records,omitempty"`
+	// If true, the response will contain only record ID and score. By default, it
+	// is false, the response will contain record details.
+	IgnoreRecordDetailsInResponse bool `protobuf:"varint,6,opt,name=ignore_record_details_in_response,json=ignoreRecordDetailsInResponse,proto3" json:"ignore_record_details_in_response,omitempty"`
+}
+
+func (x *RankRequest) Reset() {
+	*x = RankRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RankRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RankRequest) ProtoMessage() {}
+
+func (x *RankRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RankRequest.ProtoReflect.Descriptor instead.
+func (*RankRequest) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *RankRequest) GetRankingConfig() string {
+	if x != nil {
+		return x.RankingConfig
+	}
+	return ""
+}
+
+func (x *RankRequest) GetModel() string {
+	if x != nil {
+		return x.Model
+	}
+	return ""
+}
+
+func (x *RankRequest) GetTopN() int32 {
+	if x != nil {
+		return x.TopN
+	}
+	return 0
+}
+
+func (x *RankRequest) GetQuery() string {
+	if x != nil {
+		return x.Query
+	}
+	return ""
+}
+
+func (x *RankRequest) GetRecords() []*RankingRecord {
+	if x != nil {
+		return x.Records
+	}
+	return nil
+}
+
+func (x *RankRequest) GetIgnoreRecordDetailsInResponse() bool {
+	if x != nil {
+		return x.IgnoreRecordDetailsInResponse
+	}
+	return false
+}
+
+// Response message for
+// [RankService.Rank][google.cloud.discoveryengine.v1alpha.RankService.Rank]
+// method.
+type RankResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// A list of records sorted by descending score.
+	Records []*RankingRecord `protobuf:"bytes,5,rep,name=records,proto3" json:"records,omitempty"`
+}
+
+func (x *RankResponse) Reset() {
+	*x = RankResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RankResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RankResponse) ProtoMessage() {}
+
+func (x *RankResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RankResponse.ProtoReflect.Descriptor instead.
+func (*RankResponse) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *RankResponse) GetRecords() []*RankingRecord {
+	if x != nil {
+		return x.Records
+	}
+	return nil
+}
+
+var File_google_cloud_discoveryengine_v1alpha_rank_service_proto protoreflect.FileDescriptor
+
+var file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDesc = []byte{
+	0x0a, 0x37, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2f, 0x63, 0x6c, 0x6f, 0x75, 0x64, 0x2f, 0x64,
+	0x69, 0x73, 0x63, 0x6f, 0x76, 0x65, 0x72, 0x79, 0x65, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x2f, 0x76,
+	0x31, 0x61, 0x6c, 0x70, 0x68, 0x61, 0x2f, 0x72, 0x61, 0x6e, 0x6b, 0x5f, 0x73, 0x65, 0x72, 0x76,
+	0x69, 0x63, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x24, 0x67, 0x6f, 0x6f, 0x67, 0x6c,
+	0x65, 0x2e, 0x63, 0x6c, 0x6f, 0x75, 0x64, 0x2e, 0x64, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65, 0x72,
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+	0x6f, 0x33,
+}
+
+var (
+	file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescOnce sync.Once
+	file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescData = file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDesc
+)
+
+func file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescGZIP() []byte {
+	file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescOnce.Do(func() {
+		file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescData = protoimpl.X.CompressGZIP(file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescData)
+	})
+	return file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDescData
+}
+
+var file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_google_cloud_discoveryengine_v1alpha_rank_service_proto_goTypes = []interface{}{
+	(*RankingRecord)(nil), // 0: google.cloud.discoveryengine.v1alpha.RankingRecord
+	(*RankRequest)(nil),   // 1: google.cloud.discoveryengine.v1alpha.RankRequest
+	(*RankResponse)(nil),  // 2: google.cloud.discoveryengine.v1alpha.RankResponse
+}
+var file_google_cloud_discoveryengine_v1alpha_rank_service_proto_depIdxs = []int32{
+	0, // 0: google.cloud.discoveryengine.v1alpha.RankRequest.records:type_name -> google.cloud.discoveryengine.v1alpha.RankingRecord
+	0, // 1: google.cloud.discoveryengine.v1alpha.RankResponse.records:type_name -> google.cloud.discoveryengine.v1alpha.RankingRecord
+	1, // 2: google.cloud.discoveryengine.v1alpha.RankService.Rank:input_type -> google.cloud.discoveryengine.v1alpha.RankRequest
+	2, // 3: google.cloud.discoveryengine.v1alpha.RankService.Rank:output_type -> google.cloud.discoveryengine.v1alpha.RankResponse
+	3, // [3:4] is the sub-list for method output_type
+	2, // [2:3] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
+}
+
+func init() { file_google_cloud_discoveryengine_v1alpha_rank_service_proto_init() }
+func file_google_cloud_discoveryengine_v1alpha_rank_service_proto_init() {
+	if File_google_cloud_discoveryengine_v1alpha_rank_service_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RankingRecord); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RankRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RankResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   3,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_google_cloud_discoveryengine_v1alpha_rank_service_proto_goTypes,
+		DependencyIndexes: file_google_cloud_discoveryengine_v1alpha_rank_service_proto_depIdxs,
+		MessageInfos:      file_google_cloud_discoveryengine_v1alpha_rank_service_proto_msgTypes,
+	}.Build()
+	File_google_cloud_discoveryengine_v1alpha_rank_service_proto = out.File
+	file_google_cloud_discoveryengine_v1alpha_rank_service_proto_rawDesc = nil
+	file_google_cloud_discoveryengine_v1alpha_rank_service_proto_goTypes = nil
+	file_google_cloud_discoveryengine_v1alpha_rank_service_proto_depIdxs = nil
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConnInterface
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion6
+
+// RankServiceClient is the client API for RankService service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type RankServiceClient interface {
+	// Ranks a list of text records based on the given input query.
+	Rank(ctx context.Context, in *RankRequest, opts ...grpc.CallOption) (*RankResponse, error)
+}
+
+type rankServiceClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewRankServiceClient(cc grpc.ClientConnInterface) RankServiceClient {
+	return &rankServiceClient{cc}
+}
+
+func (c *rankServiceClient) Rank(ctx context.Context, in *RankRequest, opts ...grpc.CallOption) (*RankResponse, error) {
+	out := new(RankResponse)
+	err := c.cc.Invoke(ctx, "/google.cloud.discoveryengine.v1alpha.RankService/Rank", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// RankServiceServer is the server API for RankService service.
+type RankServiceServer interface {
+	// Ranks a list of text records based on the given input query.
+	Rank(context.Context, *RankRequest) (*RankResponse, error)
+}
+
+// UnimplementedRankServiceServer can be embedded to have forward compatible implementations.
+type UnimplementedRankServiceServer struct {
+}
+
+func (*UnimplementedRankServiceServer) Rank(context.Context, *RankRequest) (*RankResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Rank not implemented")
+}
+
+func RegisterRankServiceServer(s *grpc.Server, srv RankServiceServer) {
+	s.RegisterService(&_RankService_serviceDesc, srv)
+}
+
+func _RankService_Rank_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RankRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RankServiceServer).Rank(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/google.cloud.discoveryengine.v1alpha.RankService/Rank",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RankServiceServer).Rank(ctx, req.(*RankRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _RankService_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "google.cloud.discoveryengine.v1alpha.RankService",
+	HandlerType: (*RankServiceServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Rank",
+			Handler:    _RankService_Rank_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "google/cloud/discoveryengine/v1alpha/rank_service.proto",
+}
diff --git a/discoveryengine/apiv1alpha/discoveryenginepb/search_service.pb.go b/discoveryengine/apiv1alpha/discoveryenginepb/search_service.pb.go
index b0abbbebfd42..e7a5fea346cd 100755
--- a/discoveryengine/apiv1alpha/discoveryenginepb/search_service.pb.go
+++ b/discoveryengine/apiv1alpha/discoveryenginepb/search_service.pb.go
@@ -41,6 +41,119 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+// The attribute(or function) for which the custom ranking is to be
+// applied.
+type SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType int32
+
+const (
+	// Unspecified AttributeType.
+	SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ATTRIBUTE_TYPE_UNSPECIFIED SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType = 0
+	// The value of the numerical field will be used to dynamically update
+	// the boost amount. In this case, the attribute_value (the x value)
+	// of the control point will be the actual value of the numerical
+	// field for which the boost_amount is specified.
+	SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_NUMERICAL SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType = 1
+	// For the freshness use case the attribute value will be the duration
+	// between the current time and the date in the datetime field
+	// specified. The value must be formatted as an XSD `dayTimeDuration`
+	// value (a restricted subset of an ISO 8601 duration value). The
+	// pattern for this is: `[nD][T[nH][nM][nS]]`.
+	// E.g. `5D`, `3DT12H30M`, `T24H`.
+	SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_FRESHNESS SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType = 2
+)
+
+// Enum value maps for SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType.
+var (
+	SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType_name = map[int32]string{
+		0: "ATTRIBUTE_TYPE_UNSPECIFIED",
+		1: "NUMERICAL",
+		2: "FRESHNESS",
+	}
+	SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType_value = map[string]int32{
+		"ATTRIBUTE_TYPE_UNSPECIFIED": 0,
+		"NUMERICAL":                  1,
+		"FRESHNESS":                  2,
+	}
+)
+
+func (x SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType) Enum() *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType {
+	p := new(SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType)
+	*p = x
+	return p
+}
+
+func (x SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[0].Descriptor()
+}
+
+func (SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType) Type() protoreflect.EnumType {
+	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[0]
+}
+
+func (x SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType.Descriptor instead.
+func (SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType) EnumDescriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDescGZIP(), []int{0, 3, 0, 0, 0}
+}
+
+// The interpolation type to be applied. Default will be linear
+// (Piecewise Linear).
+type SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType int32
+
+const (
+	// Interpolation type is unspecified. In this case, it defaults to
+	// Linear.
+	SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_INTERPOLATION_TYPE_UNSPECIFIED SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType = 0
+	// Piecewise linear interpolation will be applied.
+	SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_LINEAR SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType = 1
+)
+
+// Enum value maps for SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType.
+var (
+	SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType_name = map[int32]string{
+		0: "INTERPOLATION_TYPE_UNSPECIFIED",
+		1: "LINEAR",
+	}
+	SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType_value = map[string]int32{
+		"INTERPOLATION_TYPE_UNSPECIFIED": 0,
+		"LINEAR":                         1,
+	}
+)
+
+func (x SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType) Enum() *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType {
+	p := new(SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType)
+	*p = x
+	return p
+}
+
+func (x SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType) Descriptor() protoreflect.EnumDescriptor {
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[1].Descriptor()
+}
+
+func (SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType) Type() protoreflect.EnumType {
+	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[1]
+}
+
+func (x SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType.Descriptor instead.
+func (SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType) EnumDescriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDescGZIP(), []int{0, 3, 0, 0, 1}
+}
+
 // Enum describing under which condition query expansion should occur.
 type SearchRequest_QueryExpansionSpec_Condition int32
 
@@ -82,11 +195,11 @@ func (x SearchRequest_QueryExpansionSpec_Condition) String() string {
 }
 
 func (SearchRequest_QueryExpansionSpec_Condition) Descriptor() protoreflect.EnumDescriptor {
-	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[0].Descriptor()
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[2].Descriptor()
 }
 
 func (SearchRequest_QueryExpansionSpec_Condition) Type() protoreflect.EnumType {
-	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[0]
+	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[2]
 }
 
 func (x SearchRequest_QueryExpansionSpec_Condition) Number() protoreflect.EnumNumber {
@@ -141,11 +254,11 @@ func (x SearchRequest_SpellCorrectionSpec_Mode) String() string {
 }
 
 func (SearchRequest_SpellCorrectionSpec_Mode) Descriptor() protoreflect.EnumDescriptor {
-	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[1].Descriptor()
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[3].Descriptor()
 }
 
 func (SearchRequest_SpellCorrectionSpec_Mode) Type() protoreflect.EnumType {
-	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[1]
+	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[3]
 }
 
 func (x SearchRequest_SpellCorrectionSpec_Mode) Number() protoreflect.EnumNumber {
@@ -200,11 +313,11 @@ func (x SearchRequest_ContentSearchSpec_SearchResultMode) String() string {
 }
 
 func (SearchRequest_ContentSearchSpec_SearchResultMode) Descriptor() protoreflect.EnumDescriptor {
-	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[2].Descriptor()
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[4].Descriptor()
 }
 
 func (SearchRequest_ContentSearchSpec_SearchResultMode) Type() protoreflect.EnumType {
-	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[2]
+	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[4]
 }
 
 func (x SearchRequest_ContentSearchSpec_SearchResultMode) Number() protoreflect.EnumNumber {
@@ -282,11 +395,11 @@ func (x SearchResponse_Summary_SummarySkippedReason) String() string {
 }
 
 func (SearchResponse_Summary_SummarySkippedReason) Descriptor() protoreflect.EnumDescriptor {
-	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[3].Descriptor()
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[5].Descriptor()
 }
 
 func (SearchResponse_Summary_SummarySkippedReason) Type() protoreflect.EnumType {
-	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[3]
+	return &file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes[5]
 }
 
 func (x SearchResponse_Summary_SummarySkippedReason) Number() protoreflect.EnumNumber {
@@ -324,11 +437,15 @@ type SearchRequest struct {
 	// Raw image query.
 	ImageQuery *SearchRequest_ImageQuery `protobuf:"bytes,19,opt,name=image_query,json=imageQuery,proto3" json:"image_query,omitempty"`
 	// Maximum number of
-	// [Document][google.cloud.discoveryengine.v1alpha.Document]s to return. If
-	// unspecified, defaults to a reasonable value. The maximum allowed value is
-	// 100. Values above 100 are coerced to 100.
+	// [Document][google.cloud.discoveryengine.v1alpha.Document]s to return. The
+	// maximum allowed value depends on the data type. Values above the maximum
+	// value are coerced to the maximum value.
 	//
-	// If this field is negative, an  `INVALID_ARGUMENT`  is returned.
+	// * Websites with basic indexing: Default `10`, Maximum `25`.
+	// * Websites with advanced indexing: Default `25`, Maximum `50`.
+	// * Other: Default `50`, Maximum `100`.
+	//
+	// If this field is negative, an  `INVALID_ARGUMENT` is returned.
 	PageSize int32 `protobuf:"varint,4,opt,name=page_size,json=pageSize,proto3" json:"page_size,omitempty"`
 	// A page token received from a previous
 	// [SearchService.Search][google.cloud.discoveryengine.v1alpha.SearchService.Search]
@@ -451,7 +568,8 @@ type SearchRequest struct {
 	//
 	// If
 	// [SearchRequest.EmbeddingSpec.EmbeddingVector.field_path][google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec.EmbeddingVector.field_path]
-	// is not provided, it will use [ServingConfig.EmbeddingConfig.field_path][].
+	// is not provided, it will use
+	// [ServingConfig.EmbeddingConfig.field_path][google.cloud.discoveryengine.v1alpha.ServingConfig.embedding_config].
 	EmbeddingSpec *SearchRequest_EmbeddingSpec `protobuf:"bytes,23,opt,name=embedding_spec,json=embeddingSpec,proto3" json:"embedding_spec,omitempty"`
 	// The ranking expression controls the customized ranking on retrieval
 	// documents. This overrides
@@ -1313,6 +1431,12 @@ type SearchRequest_ContentSearchSpec struct {
 	//     it defaults to `CHUNKS`.
 	//   - Otherwise, it defaults to `DOCUMENTS`.
 	SearchResultMode SearchRequest_ContentSearchSpec_SearchResultMode `protobuf:"varint,4,opt,name=search_result_mode,json=searchResultMode,proto3,enum=google.cloud.discoveryengine.v1alpha.SearchRequest_ContentSearchSpec_SearchResultMode" json:"search_result_mode,omitempty"`
+	// Specifies the chunk spec to be returned from the search response.
+	// Only available if the
+	// [SearchRequest.ContentSearchSpec.search_result_mode][google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.search_result_mode]
+	// is set to
+	// [CHUNKS][google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SearchResultMode.CHUNKS]
+	ChunkSpec *SearchRequest_ContentSearchSpec_ChunkSpec `protobuf:"bytes,5,opt,name=chunk_spec,json=chunkSpec,proto3" json:"chunk_spec,omitempty"`
 }
 
 func (x *SearchRequest_ContentSearchSpec) Reset() {
@@ -1375,6 +1499,13 @@ func (x *SearchRequest_ContentSearchSpec) GetSearchResultMode() SearchRequest_Co
 	return SearchRequest_ContentSearchSpec_SEARCH_RESULT_MODE_UNSPECIFIED
 }
 
+func (x *SearchRequest_ContentSearchSpec) GetChunkSpec() *SearchRequest_ContentSearchSpec_ChunkSpec {
+	if x != nil {
+		return x.ChunkSpec
+	}
+	return nil
+}
+
 // The specification that uses customized query embedding vector to do
 // semantic document retrieval.
 type SearchRequest_EmbeddingSpec struct {
@@ -1583,21 +1714,26 @@ type SearchRequest_BoostSpec_ConditionBoostSpec struct {
 	// Strength of the condition boost, which should be in [-1, 1]. Negative
 	// boost means demotion. Default is 0.0.
 	//
-	// Setting to 1.0 gives the document a big promotion. However, it does not
-	// necessarily mean that the boosted document will be the top result at
-	// all times, nor that other documents will be excluded. Results could
-	// still be shown even when none of them matches the condition. And
-	// results that are significantly more relevant to the search query can
-	// still trump your heavily favored but irrelevant documents.
+	// Setting to 1.0 gives the document a big promotion. However, it does
+	// not necessarily mean that the boosted document will be the top result
+	// at all times, nor that other documents will be excluded. Results
+	// could still be shown even when none of them matches the condition.
+	// And results that are significantly more relevant to the search query
+	// can still trump your heavily favored but irrelevant documents.
 	//
 	// Setting to -1.0 gives the document a big demotion. However, results
 	// that are deeply relevant might still be shown. The document will have
-	// an upstream battle to get a fairly high ranking, but it is not blocked
-	// out completely.
+	// an upstream battle to get a fairly high ranking, but it is not
+	// blocked out completely.
 	//
 	// Setting to 0.0 means no boost applied. The boosting condition is
-	// ignored.
+	// ignored. Only one of the (condition, boost) combination or the
+	// boost_control_spec below are set. If both are set then the global boost
+	// is ignored and the more fine-grained boost_control_spec is applied.
 	Boost float32 `protobuf:"fixed32,2,opt,name=boost,proto3" json:"boost,omitempty"`
+	// Complex specification for custom ranking based on customer defined
+	// attribute value.
+	BoostControlSpec *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec `protobuf:"bytes,3,opt,name=boost_control_spec,json=boostControlSpec,proto3" json:"boost_control_spec,omitempty"`
 }
 
 func (x *SearchRequest_BoostSpec_ConditionBoostSpec) Reset() {
@@ -1646,6 +1782,165 @@ func (x *SearchRequest_BoostSpec_ConditionBoostSpec) GetBoost() float32 {
 	return 0
 }
 
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec) GetBoostControlSpec() *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec {
+	if x != nil {
+		return x.BoostControlSpec
+	}
+	return nil
+}
+
+// Specification for custom ranking based on customer specified attribute
+// value. It provides more controls for customized ranking than the simple
+// (condition, boost) combination above.
+type SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The name of the field whose value will be used to determine the
+	// boost amount.
+	FieldName string `protobuf:"bytes,1,opt,name=field_name,json=fieldName,proto3" json:"field_name,omitempty"`
+	// The attribute type to be used to determine the boost amount. The
+	// attribute value can be derived from the field value of the specified
+	// field_name. In the case of numerical it is straightforward i.e.
+	// attribute_value = numerical_field_value. In the case of freshness
+	// however, attribute_value = (time.now() - datetime_field_value).
+	AttributeType SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType `protobuf:"varint,2,opt,name=attribute_type,json=attributeType,proto3,enum=google.cloud.discoveryengine.v1alpha.SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType" json:"attribute_type,omitempty"`
+	// The interpolation type to be applied to connect the control points
+	// listed below.
+	InterpolationType SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType `protobuf:"varint,3,opt,name=interpolation_type,json=interpolationType,proto3,enum=google.cloud.discoveryengine.v1alpha.SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType" json:"interpolation_type,omitempty"`
+	// The control points used to define the curve. The monotonic function
+	// (defined through the interpolation_type above) passes through the
+	// control points listed here.
+	ControlPoints []*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint `protobuf:"bytes,4,rep,name=control_points,json=controlPoints,proto3" json:"control_points,omitempty"`
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec) Reset() {
+	*x = SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[14]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec) ProtoMessage() {}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[14]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec.ProtoReflect.Descriptor instead.
+func (*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDescGZIP(), []int{0, 3, 0, 0}
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec) GetFieldName() string {
+	if x != nil {
+		return x.FieldName
+	}
+	return ""
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec) GetAttributeType() SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType {
+	if x != nil {
+		return x.AttributeType
+	}
+	return SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ATTRIBUTE_TYPE_UNSPECIFIED
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec) GetInterpolationType() SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType {
+	if x != nil {
+		return x.InterpolationType
+	}
+	return SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_INTERPOLATION_TYPE_UNSPECIFIED
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec) GetControlPoints() []*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint {
+	if x != nil {
+		return x.ControlPoints
+	}
+	return nil
+}
+
+// The control points used to define the curve. The curve defined
+// through these control points can only be monotonically increasing
+// or decreasing(constant values are acceptable).
+type SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Can be one of:
+	// 1. The numerical field value.
+	// 2. The duration spec for freshness:
+	// The value must be formatted as an XSD `dayTimeDuration` value (a
+	// restricted subset of an ISO 8601 duration value). The pattern for
+	// this is: `[nD][T[nH][nM][nS]]`.
+	AttributeValue string `protobuf:"bytes,1,opt,name=attribute_value,json=attributeValue,proto3" json:"attribute_value,omitempty"`
+	// The value between -1 to 1 by which to boost the score if the
+	// attribute_value evaluates to the value specified above.
+	BoostAmount float32 `protobuf:"fixed32,2,opt,name=boost_amount,json=boostAmount,proto3" json:"boost_amount,omitempty"`
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint) Reset() {
+	*x = SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[15]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint) ProtoMessage() {}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[15]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint.ProtoReflect.Descriptor instead.
+func (*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDescGZIP(), []int{0, 3, 0, 0, 0}
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint) GetAttributeValue() string {
+	if x != nil {
+		return x.AttributeValue
+	}
+	return ""
+}
+
+func (x *SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint) GetBoostAmount() float32 {
+	if x != nil {
+		return x.BoostAmount
+	}
+	return 0
+}
+
 // A specification for configuring snippets in a search response.
 type SearchRequest_ContentSearchSpec_SnippetSpec struct {
 	state         protoimpl.MessageState
@@ -1672,7 +1967,7 @@ type SearchRequest_ContentSearchSpec_SnippetSpec struct {
 func (x *SearchRequest_ContentSearchSpec_SnippetSpec) Reset() {
 	*x = SearchRequest_ContentSearchSpec_SnippetSpec{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[14]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1685,7 +1980,7 @@ func (x *SearchRequest_ContentSearchSpec_SnippetSpec) String() string {
 func (*SearchRequest_ContentSearchSpec_SnippetSpec) ProtoMessage() {}
 
 func (x *SearchRequest_ContentSearchSpec_SnippetSpec) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[14]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1788,12 +2083,19 @@ type SearchRequest_ContentSearchSpec_SummarySpec struct {
 	// If specified, the spec will be used to modify the model specification
 	// provided to the LLM.
 	ModelSpec *SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec `protobuf:"bytes,7,opt,name=model_spec,json=modelSpec,proto3" json:"model_spec,omitempty"`
+	// If true, answer will be generated from most relevant chunks from top
+	// search results. This feature will improve summary quality.
+	// Please note that with this feature enabled, not all top search results
+	// will be referenced and included in the reference list, so the citation
+	// source index only points to the search results listed in the reference
+	// list.
+	UseSemanticChunks bool `protobuf:"varint,8,opt,name=use_semantic_chunks,json=useSemanticChunks,proto3" json:"use_semantic_chunks,omitempty"`
 }
 
 func (x *SearchRequest_ContentSearchSpec_SummarySpec) Reset() {
 	*x = SearchRequest_ContentSearchSpec_SummarySpec{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[15]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1806,7 +2108,7 @@ func (x *SearchRequest_ContentSearchSpec_SummarySpec) String() string {
 func (*SearchRequest_ContentSearchSpec_SummarySpec) ProtoMessage() {}
 
 func (x *SearchRequest_ContentSearchSpec_SummarySpec) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[15]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1871,6 +2173,13 @@ func (x *SearchRequest_ContentSearchSpec_SummarySpec) GetModelSpec() *SearchRequ
 	return nil
 }
 
+func (x *SearchRequest_ContentSearchSpec_SummarySpec) GetUseSemanticChunks() bool {
+	if x != nil {
+		return x.UseSemanticChunks
+	}
+	return false
+}
+
 // A specification for configuring the extractive content in a search
 // response.
 type SearchRequest_ContentSearchSpec_ExtractiveContentSpec struct {
@@ -1911,10 +2220,9 @@ type SearchRequest_ContentSearchSpec_ExtractiveContentSpec struct {
 	// return the `max_extractive_segment_count`.
 	MaxExtractiveSegmentCount int32 `protobuf:"varint,2,opt,name=max_extractive_segment_count,json=maxExtractiveSegmentCount,proto3" json:"max_extractive_segment_count,omitempty"`
 	// Specifies whether to return the confidence score from the extractive
-	// segments in each search result. The default value is `false`.
-	//
-	// Note: this is a priavte preview feature and only works for allowlisted
-	// users, please reach out to Cloud Support team if you want to use it.
+	// segments in each search result. This feature is available only for new
+	// or allowlisted data stores. To allowlist your data store, please
+	// contact your Customer Engineer. The default value is `false`.
 	ReturnExtractiveSegmentScore bool `protobuf:"varint,3,opt,name=return_extractive_segment_score,json=returnExtractiveSegmentScore,proto3" json:"return_extractive_segment_score,omitempty"`
 	// Specifies whether to also include the adjacent from each selected
 	// segments.
@@ -1929,7 +2237,7 @@ type SearchRequest_ContentSearchSpec_ExtractiveContentSpec struct {
 func (x *SearchRequest_ContentSearchSpec_ExtractiveContentSpec) Reset() {
 	*x = SearchRequest_ContentSearchSpec_ExtractiveContentSpec{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[16]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[18]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1942,7 +2250,7 @@ func (x *SearchRequest_ContentSearchSpec_ExtractiveContentSpec) String() string
 func (*SearchRequest_ContentSearchSpec_ExtractiveContentSpec) ProtoMessage() {}
 
 func (x *SearchRequest_ContentSearchSpec_ExtractiveContentSpec) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[16]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[18]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1993,6 +2301,72 @@ func (x *SearchRequest_ContentSearchSpec_ExtractiveContentSpec) GetNumNextSegmen
 	return 0
 }
 
+// Specifies the chunk spec to be returned from the search response.
+// Only available if the
+// [SearchRequest.ContentSearchSpec.search_result_mode][google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.search_result_mode]
+// is set to
+// [CHUNKS][google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SearchResultMode.CHUNKS]
+type SearchRequest_ContentSearchSpec_ChunkSpec struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The number of previous chunks to be returned of the current chunk. The
+	// maximum allowed value is 3.
+	// If not specified, no previous chunks will be returned.
+	NumPreviousChunks int32 `protobuf:"varint,1,opt,name=num_previous_chunks,json=numPreviousChunks,proto3" json:"num_previous_chunks,omitempty"`
+	// The number of next chunks to be returned of the current chunk. The
+	// maximum allowed value is 3.
+	// If not specified, no next chunks will be returned.
+	NumNextChunks int32 `protobuf:"varint,2,opt,name=num_next_chunks,json=numNextChunks,proto3" json:"num_next_chunks,omitempty"`
+}
+
+func (x *SearchRequest_ContentSearchSpec_ChunkSpec) Reset() {
+	*x = SearchRequest_ContentSearchSpec_ChunkSpec{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[19]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SearchRequest_ContentSearchSpec_ChunkSpec) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SearchRequest_ContentSearchSpec_ChunkSpec) ProtoMessage() {}
+
+func (x *SearchRequest_ContentSearchSpec_ChunkSpec) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[19]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SearchRequest_ContentSearchSpec_ChunkSpec.ProtoReflect.Descriptor instead.
+func (*SearchRequest_ContentSearchSpec_ChunkSpec) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDescGZIP(), []int{0, 6, 3}
+}
+
+func (x *SearchRequest_ContentSearchSpec_ChunkSpec) GetNumPreviousChunks() int32 {
+	if x != nil {
+		return x.NumPreviousChunks
+	}
+	return 0
+}
+
+func (x *SearchRequest_ContentSearchSpec_ChunkSpec) GetNumNextChunks() int32 {
+	if x != nil {
+		return x.NumNextChunks
+	}
+	return 0
+}
+
 // Specification of the prompt to use with the model.
 type SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec struct {
 	state         protoimpl.MessageState
@@ -2007,7 +2381,7 @@ type SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec struct {
 func (x *SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec) Reset() {
 	*x = SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[17]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[20]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2020,7 +2394,7 @@ func (x *SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec) String() s
 func (*SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec) ProtoMessage() {}
 
 func (x *SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[17]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[20]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2054,18 +2428,20 @@ type SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec struct {
 	// Supported values are:
 	//
 	//   - `stable`: string. Default value when no value is specified. Uses a
-	//     generally available, fine-tuned version of the text-bison@001
-	//     model.
-	//   - `preview`: string. (Public preview) Uses a fine-tuned version of
-	//     the text-bison@002 model. This model works only for summaries in
-	//     English.
+	//     generally available, fine-tuned model. For more information, see
+	//     [Answer generation model versions and
+	//     lifecycle](https://cloud.google.com/generative-ai-app-builder/docs/answer-generation-models).
+	//   - `preview`: string. (Public preview) Uses a preview model. For more
+	//     information, see
+	//     [Answer generation model versions and
+	//     lifecycle](https://cloud.google.com/generative-ai-app-builder/docs/answer-generation-models).
 	Version string `protobuf:"bytes,1,opt,name=version,proto3" json:"version,omitempty"`
 }
 
 func (x *SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec) Reset() {
 	*x = SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[18]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[21]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2078,7 +2454,7 @@ func (x *SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec) String() string
 func (*SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec) ProtoMessage() {}
 
 func (x *SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[18]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[21]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2116,7 +2492,7 @@ type SearchRequest_EmbeddingSpec_EmbeddingVector struct {
 func (x *SearchRequest_EmbeddingSpec_EmbeddingVector) Reset() {
 	*x = SearchRequest_EmbeddingSpec_EmbeddingVector{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[19]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[22]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2129,7 +2505,7 @@ func (x *SearchRequest_EmbeddingSpec_EmbeddingVector) String() string {
 func (*SearchRequest_EmbeddingSpec_EmbeddingVector) ProtoMessage() {}
 
 func (x *SearchRequest_EmbeddingSpec_EmbeddingVector) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[19]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[22]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2183,7 +2559,7 @@ type SearchResponse_SearchResult struct {
 func (x *SearchResponse_SearchResult) Reset() {
 	*x = SearchResponse_SearchResult{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[20]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[23]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2196,7 +2572,7 @@ func (x *SearchResponse_SearchResult) String() string {
 func (*SearchResponse_SearchResult) ProtoMessage() {}
 
 func (x *SearchResponse_SearchResult) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[20]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[23]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2258,7 +2634,7 @@ type SearchResponse_Facet struct {
 func (x *SearchResponse_Facet) Reset() {
 	*x = SearchResponse_Facet{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[21]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[24]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2271,7 +2647,7 @@ func (x *SearchResponse_Facet) String() string {
 func (*SearchResponse_Facet) ProtoMessage() {}
 
 func (x *SearchResponse_Facet) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[21]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[24]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2324,7 +2700,7 @@ type SearchResponse_GuidedSearchResult struct {
 func (x *SearchResponse_GuidedSearchResult) Reset() {
 	*x = SearchResponse_GuidedSearchResult{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[22]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[25]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2337,7 +2713,7 @@ func (x *SearchResponse_GuidedSearchResult) String() string {
 func (*SearchResponse_GuidedSearchResult) ProtoMessage() {}
 
 func (x *SearchResponse_GuidedSearchResult) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[22]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[25]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2388,7 +2764,7 @@ type SearchResponse_Summary struct {
 func (x *SearchResponse_Summary) Reset() {
 	*x = SearchResponse_Summary{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[23]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[26]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2401,7 +2777,7 @@ func (x *SearchResponse_Summary) String() string {
 func (*SearchResponse_Summary) ProtoMessage() {}
 
 func (x *SearchResponse_Summary) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[23]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[26]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2461,7 +2837,7 @@ type SearchResponse_GeoSearchDebugInfo struct {
 func (x *SearchResponse_GeoSearchDebugInfo) Reset() {
 	*x = SearchResponse_GeoSearchDebugInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[24]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[27]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2474,7 +2850,7 @@ func (x *SearchResponse_GeoSearchDebugInfo) String() string {
 func (*SearchResponse_GeoSearchDebugInfo) ProtoMessage() {}
 
 func (x *SearchResponse_GeoSearchDebugInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[24]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[27]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2523,7 +2899,7 @@ type SearchResponse_QueryExpansionInfo struct {
 func (x *SearchResponse_QueryExpansionInfo) Reset() {
 	*x = SearchResponse_QueryExpansionInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[25]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[28]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2536,7 +2912,7 @@ func (x *SearchResponse_QueryExpansionInfo) String() string {
 func (*SearchResponse_QueryExpansionInfo) ProtoMessage() {}
 
 func (x *SearchResponse_QueryExpansionInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[25]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[28]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2586,7 +2962,7 @@ type SearchResponse_Facet_FacetValue struct {
 func (x *SearchResponse_Facet_FacetValue) Reset() {
 	*x = SearchResponse_Facet_FacetValue{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[27]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[30]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2599,7 +2975,7 @@ func (x *SearchResponse_Facet_FacetValue) String() string {
 func (*SearchResponse_Facet_FacetValue) ProtoMessage() {}
 
 func (x *SearchResponse_Facet_FacetValue) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[27]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[30]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2678,7 +3054,7 @@ type SearchResponse_GuidedSearchResult_RefinementAttribute struct {
 func (x *SearchResponse_GuidedSearchResult_RefinementAttribute) Reset() {
 	*x = SearchResponse_GuidedSearchResult_RefinementAttribute{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[28]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[31]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2691,7 +3067,7 @@ func (x *SearchResponse_GuidedSearchResult_RefinementAttribute) String() string
 func (*SearchResponse_GuidedSearchResult_RefinementAttribute) ProtoMessage() {}
 
 func (x *SearchResponse_GuidedSearchResult_RefinementAttribute) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[28]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[31]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2738,7 +3114,7 @@ type SearchResponse_Summary_SafetyAttributes struct {
 func (x *SearchResponse_Summary_SafetyAttributes) Reset() {
 	*x = SearchResponse_Summary_SafetyAttributes{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[29]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2751,7 +3127,7 @@ func (x *SearchResponse_Summary_SafetyAttributes) String() string {
 func (*SearchResponse_Summary_SafetyAttributes) ProtoMessage() {}
 
 func (x *SearchResponse_Summary_SafetyAttributes) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[29]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2794,7 +3170,7 @@ type SearchResponse_Summary_CitationMetadata struct {
 func (x *SearchResponse_Summary_CitationMetadata) Reset() {
 	*x = SearchResponse_Summary_CitationMetadata{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[30]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[33]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2807,7 +3183,7 @@ func (x *SearchResponse_Summary_CitationMetadata) String() string {
 func (*SearchResponse_Summary_CitationMetadata) ProtoMessage() {}
 
 func (x *SearchResponse_Summary_CitationMetadata) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[30]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[33]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2847,7 +3223,7 @@ type SearchResponse_Summary_Citation struct {
 func (x *SearchResponse_Summary_Citation) Reset() {
 	*x = SearchResponse_Summary_Citation{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[31]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[34]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2860,7 +3236,7 @@ func (x *SearchResponse_Summary_Citation) String() string {
 func (*SearchResponse_Summary_Citation) ProtoMessage() {}
 
 func (x *SearchResponse_Summary_Citation) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[31]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[34]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2912,7 +3288,7 @@ type SearchResponse_Summary_CitationSource struct {
 func (x *SearchResponse_Summary_CitationSource) Reset() {
 	*x = SearchResponse_Summary_CitationSource{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[32]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[35]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2925,7 +3301,7 @@ func (x *SearchResponse_Summary_CitationSource) String() string {
 func (*SearchResponse_Summary_CitationSource) ProtoMessage() {}
 
 func (x *SearchResponse_Summary_CitationSource) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[32]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[35]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2964,12 +3340,14 @@ type SearchResponse_Summary_Reference struct {
 	Document string `protobuf:"bytes,2,opt,name=document,proto3" json:"document,omitempty"`
 	// Cloud Storage or HTTP uri for the document.
 	Uri string `protobuf:"bytes,3,opt,name=uri,proto3" json:"uri,omitempty"`
+	// List of cited chunk contents derived from document content.
+	ChunkContents []*SearchResponse_Summary_Reference_ChunkContent `protobuf:"bytes,4,rep,name=chunk_contents,json=chunkContents,proto3" json:"chunk_contents,omitempty"`
 }
 
 func (x *SearchResponse_Summary_Reference) Reset() {
 	*x = SearchResponse_Summary_Reference{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[33]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[36]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2982,7 +3360,7 @@ func (x *SearchResponse_Summary_Reference) String() string {
 func (*SearchResponse_Summary_Reference) ProtoMessage() {}
 
 func (x *SearchResponse_Summary_Reference) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[33]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[36]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3019,6 +3397,13 @@ func (x *SearchResponse_Summary_Reference) GetUri() string {
 	return ""
 }
 
+func (x *SearchResponse_Summary_Reference) GetChunkContents() []*SearchResponse_Summary_Reference_ChunkContent {
+	if x != nil {
+		return x.ChunkContents
+	}
+	return nil
+}
+
 // Summary with metadata information.
 type SearchResponse_Summary_SummaryWithMetadata struct {
 	state         protoimpl.MessageState
@@ -3036,7 +3421,7 @@ type SearchResponse_Summary_SummaryWithMetadata struct {
 func (x *SearchResponse_Summary_SummaryWithMetadata) Reset() {
 	*x = SearchResponse_Summary_SummaryWithMetadata{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[34]
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[37]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -3049,7 +3434,7 @@ func (x *SearchResponse_Summary_SummaryWithMetadata) String() string {
 func (*SearchResponse_Summary_SummaryWithMetadata) ProtoMessage() {}
 
 func (x *SearchResponse_Summary_SummaryWithMetadata) ProtoReflect() protoreflect.Message {
-	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[34]
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[37]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -3086,6 +3471,64 @@ func (x *SearchResponse_Summary_SummaryWithMetadata) GetReferences() []*SearchRe
 	return nil
 }
 
+// Chunk content.
+type SearchResponse_Summary_Reference_ChunkContent struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Chunk textual content.
+	Content string `protobuf:"bytes,1,opt,name=content,proto3" json:"content,omitempty"`
+	// Page identifier.
+	PageIdentifier string `protobuf:"bytes,2,opt,name=page_identifier,json=pageIdentifier,proto3" json:"page_identifier,omitempty"`
+}
+
+func (x *SearchResponse_Summary_Reference_ChunkContent) Reset() {
+	*x = SearchResponse_Summary_Reference_ChunkContent{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[38]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SearchResponse_Summary_Reference_ChunkContent) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SearchResponse_Summary_Reference_ChunkContent) ProtoMessage() {}
+
+func (x *SearchResponse_Summary_Reference_ChunkContent) ProtoReflect() protoreflect.Message {
+	mi := &file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[38]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SearchResponse_Summary_Reference_ChunkContent.ProtoReflect.Descriptor instead.
+func (*SearchResponse_Summary_Reference_ChunkContent) Descriptor() ([]byte, []int) {
+	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDescGZIP(), []int{1, 3, 4, 0}
+}
+
+func (x *SearchResponse_Summary_Reference_ChunkContent) GetContent() string {
+	if x != nil {
+		return x.Content
+	}
+	return ""
+}
+
+func (x *SearchResponse_Summary_Reference_ChunkContent) GetPageIdentifier() string {
+	if x != nil {
+		return x.PageIdentifier
+	}
+	return ""
+}
+
 var File_google_cloud_discoveryengine_v1alpha_search_service_proto protoreflect.FileDescriptor
 
 var file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDesc = []byte{
@@ -3113,7 +3556,7 @@ var file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDesc = []b
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@@ -3266,7 +3709,7 @@ var file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDesc = []b
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 }
 
 var (
@@ -3733,109 +4262,121 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDescGZIP(
 	return file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDescData
 }
 
-var file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes = make([]protoimpl.EnumInfo, 4)
-var file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes = make([]protoimpl.MessageInfo, 35)
+var file_google_cloud_discoveryengine_v1alpha_search_service_proto_enumTypes = make([]protoimpl.EnumInfo, 6)
+var file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes = make([]protoimpl.MessageInfo, 39)
 var file_google_cloud_discoveryengine_v1alpha_search_service_proto_goTypes = []interface{}{
-	(SearchRequest_QueryExpansionSpec_Condition)(0),                     // 0: google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec.Condition
-	(SearchRequest_SpellCorrectionSpec_Mode)(0),                         // 1: google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec.Mode
-	(SearchRequest_ContentSearchSpec_SearchResultMode)(0),               // 2: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SearchResultMode
-	(SearchResponse_Summary_SummarySkippedReason)(0),                    // 3: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummarySkippedReason
-	(*SearchRequest)(nil),                                               // 4: google.cloud.discoveryengine.v1alpha.SearchRequest
-	(*SearchResponse)(nil),                                              // 5: google.cloud.discoveryengine.v1alpha.SearchResponse
-	(*SearchRequest_ImageQuery)(nil),                                    // 6: google.cloud.discoveryengine.v1alpha.SearchRequest.ImageQuery
-	(*SearchRequest_DataStoreSpec)(nil),                                 // 7: google.cloud.discoveryengine.v1alpha.SearchRequest.DataStoreSpec
-	(*SearchRequest_FacetSpec)(nil),                                     // 8: google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec
-	(*SearchRequest_BoostSpec)(nil),                                     // 9: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec
-	(*SearchRequest_QueryExpansionSpec)(nil),                            // 10: google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec
-	(*SearchRequest_SpellCorrectionSpec)(nil),                           // 11: google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec
-	(*SearchRequest_ContentSearchSpec)(nil),                             // 12: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec
-	(*SearchRequest_EmbeddingSpec)(nil),                                 // 13: google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec
-	nil,                                                                 // 14: google.cloud.discoveryengine.v1alpha.SearchRequest.ParamsEntry
-	nil,                                                                 // 15: google.cloud.discoveryengine.v1alpha.SearchRequest.UserLabelsEntry
-	(*SearchRequest_FacetSpec_FacetKey)(nil),                            // 16: google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec.FacetKey
-	(*SearchRequest_BoostSpec_ConditionBoostSpec)(nil),                  // 17: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec
-	(*SearchRequest_ContentSearchSpec_SnippetSpec)(nil),                 // 18: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SnippetSpec
-	(*SearchRequest_ContentSearchSpec_SummarySpec)(nil),                 // 19: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec
-	(*SearchRequest_ContentSearchSpec_ExtractiveContentSpec)(nil),       // 20: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.ExtractiveContentSpec
-	(*SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec)(nil), // 21: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.ModelPromptSpec
-	(*SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec)(nil),       // 22: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.ModelSpec
-	(*SearchRequest_EmbeddingSpec_EmbeddingVector)(nil),                 // 23: google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec.EmbeddingVector
-	(*SearchResponse_SearchResult)(nil),                                 // 24: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult
-	(*SearchResponse_Facet)(nil),                                        // 25: google.cloud.discoveryengine.v1alpha.SearchResponse.Facet
-	(*SearchResponse_GuidedSearchResult)(nil),                           // 26: google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult
-	(*SearchResponse_Summary)(nil),                                      // 27: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary
-	(*SearchResponse_GeoSearchDebugInfo)(nil),                           // 28: google.cloud.discoveryengine.v1alpha.SearchResponse.GeoSearchDebugInfo
-	(*SearchResponse_QueryExpansionInfo)(nil),                           // 29: google.cloud.discoveryengine.v1alpha.SearchResponse.QueryExpansionInfo
-	nil,                                     // 30: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.ModelScoresEntry
-	(*SearchResponse_Facet_FacetValue)(nil), // 31: google.cloud.discoveryengine.v1alpha.SearchResponse.Facet.FacetValue
-	(*SearchResponse_GuidedSearchResult_RefinementAttribute)(nil), // 32: google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult.RefinementAttribute
-	(*SearchResponse_Summary_SafetyAttributes)(nil),               // 33: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SafetyAttributes
-	(*SearchResponse_Summary_CitationMetadata)(nil),               // 34: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationMetadata
-	(*SearchResponse_Summary_Citation)(nil),                       // 35: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Citation
-	(*SearchResponse_Summary_CitationSource)(nil),                 // 36: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationSource
-	(*SearchResponse_Summary_Reference)(nil),                      // 37: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Reference
-	(*SearchResponse_Summary_SummaryWithMetadata)(nil),            // 38: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummaryWithMetadata
-	(*UserInfo)(nil),             // 39: google.cloud.discoveryengine.v1alpha.UserInfo
-	(*CustomFineTuningSpec)(nil), // 40: google.cloud.discoveryengine.v1alpha.CustomFineTuningSpec
-	(*structpb.Value)(nil),       // 41: google.protobuf.Value
-	(*Interval)(nil),             // 42: google.cloud.discoveryengine.v1alpha.Interval
-	(*Document)(nil),             // 43: google.cloud.discoveryengine.v1alpha.Document
-	(*Chunk)(nil),                // 44: google.cloud.discoveryengine.v1alpha.Chunk
-	(*DoubleList)(nil),           // 45: google.cloud.discoveryengine.v1alpha.DoubleList
+	(SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_AttributeType)(0),     // 0: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec.AttributeType
+	(SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_InterpolationType)(0), // 1: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec.InterpolationType
+	(SearchRequest_QueryExpansionSpec_Condition)(0),                                    // 2: google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec.Condition
+	(SearchRequest_SpellCorrectionSpec_Mode)(0),                                        // 3: google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec.Mode
+	(SearchRequest_ContentSearchSpec_SearchResultMode)(0),                              // 4: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SearchResultMode
+	(SearchResponse_Summary_SummarySkippedReason)(0),                                   // 5: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummarySkippedReason
+	(*SearchRequest)(nil),                              // 6: google.cloud.discoveryengine.v1alpha.SearchRequest
+	(*SearchResponse)(nil),                             // 7: google.cloud.discoveryengine.v1alpha.SearchResponse
+	(*SearchRequest_ImageQuery)(nil),                   // 8: google.cloud.discoveryengine.v1alpha.SearchRequest.ImageQuery
+	(*SearchRequest_DataStoreSpec)(nil),                // 9: google.cloud.discoveryengine.v1alpha.SearchRequest.DataStoreSpec
+	(*SearchRequest_FacetSpec)(nil),                    // 10: google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec
+	(*SearchRequest_BoostSpec)(nil),                    // 11: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec
+	(*SearchRequest_QueryExpansionSpec)(nil),           // 12: google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec
+	(*SearchRequest_SpellCorrectionSpec)(nil),          // 13: google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec
+	(*SearchRequest_ContentSearchSpec)(nil),            // 14: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec
+	(*SearchRequest_EmbeddingSpec)(nil),                // 15: google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec
+	nil,                                                // 16: google.cloud.discoveryengine.v1alpha.SearchRequest.ParamsEntry
+	nil,                                                // 17: google.cloud.discoveryengine.v1alpha.SearchRequest.UserLabelsEntry
+	(*SearchRequest_FacetSpec_FacetKey)(nil),           // 18: google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec.FacetKey
+	(*SearchRequest_BoostSpec_ConditionBoostSpec)(nil), // 19: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec
+	(*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec)(nil),              // 20: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec
+	(*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint)(nil), // 21: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec.ControlPoint
+	(*SearchRequest_ContentSearchSpec_SnippetSpec)(nil),                              // 22: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SnippetSpec
+	(*SearchRequest_ContentSearchSpec_SummarySpec)(nil),                              // 23: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec
+	(*SearchRequest_ContentSearchSpec_ExtractiveContentSpec)(nil),                    // 24: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.ExtractiveContentSpec
+	(*SearchRequest_ContentSearchSpec_ChunkSpec)(nil),                                // 25: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.ChunkSpec
+	(*SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec)(nil),              // 26: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.ModelPromptSpec
+	(*SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec)(nil),                    // 27: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.ModelSpec
+	(*SearchRequest_EmbeddingSpec_EmbeddingVector)(nil),                              // 28: google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec.EmbeddingVector
+	(*SearchResponse_SearchResult)(nil),                                              // 29: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult
+	(*SearchResponse_Facet)(nil),                                                     // 30: google.cloud.discoveryengine.v1alpha.SearchResponse.Facet
+	(*SearchResponse_GuidedSearchResult)(nil),                                        // 31: google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult
+	(*SearchResponse_Summary)(nil),                                                   // 32: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary
+	(*SearchResponse_GeoSearchDebugInfo)(nil),                                        // 33: google.cloud.discoveryengine.v1alpha.SearchResponse.GeoSearchDebugInfo
+	(*SearchResponse_QueryExpansionInfo)(nil),                                        // 34: google.cloud.discoveryengine.v1alpha.SearchResponse.QueryExpansionInfo
+	nil,                                     // 35: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.ModelScoresEntry
+	(*SearchResponse_Facet_FacetValue)(nil), // 36: google.cloud.discoveryengine.v1alpha.SearchResponse.Facet.FacetValue
+	(*SearchResponse_GuidedSearchResult_RefinementAttribute)(nil), // 37: google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult.RefinementAttribute
+	(*SearchResponse_Summary_SafetyAttributes)(nil),               // 38: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SafetyAttributes
+	(*SearchResponse_Summary_CitationMetadata)(nil),               // 39: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationMetadata
+	(*SearchResponse_Summary_Citation)(nil),                       // 40: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Citation
+	(*SearchResponse_Summary_CitationSource)(nil),                 // 41: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationSource
+	(*SearchResponse_Summary_Reference)(nil),                      // 42: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Reference
+	(*SearchResponse_Summary_SummaryWithMetadata)(nil),            // 43: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummaryWithMetadata
+	(*SearchResponse_Summary_Reference_ChunkContent)(nil),         // 44: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Reference.ChunkContent
+	(*UserInfo)(nil),             // 45: google.cloud.discoveryengine.v1alpha.UserInfo
+	(*CustomFineTuningSpec)(nil), // 46: google.cloud.discoveryengine.v1alpha.CustomFineTuningSpec
+	(*structpb.Value)(nil),       // 47: google.protobuf.Value
+	(*Interval)(nil),             // 48: google.cloud.discoveryengine.v1alpha.Interval
+	(*Document)(nil),             // 49: google.cloud.discoveryengine.v1alpha.Document
+	(*Chunk)(nil),                // 50: google.cloud.discoveryengine.v1alpha.Chunk
+	(*DoubleList)(nil),           // 51: google.cloud.discoveryengine.v1alpha.DoubleList
 }
 var file_google_cloud_discoveryengine_v1alpha_search_service_proto_depIdxs = []int32{
-	6,  // 0: google.cloud.discoveryengine.v1alpha.SearchRequest.image_query:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ImageQuery
-	7,  // 1: google.cloud.discoveryengine.v1alpha.SearchRequest.data_store_specs:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.DataStoreSpec
-	39, // 2: google.cloud.discoveryengine.v1alpha.SearchRequest.user_info:type_name -> google.cloud.discoveryengine.v1alpha.UserInfo
-	8,  // 3: google.cloud.discoveryengine.v1alpha.SearchRequest.facet_specs:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec
-	9,  // 4: google.cloud.discoveryengine.v1alpha.SearchRequest.boost_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec
-	14, // 5: google.cloud.discoveryengine.v1alpha.SearchRequest.params:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ParamsEntry
-	10, // 6: google.cloud.discoveryengine.v1alpha.SearchRequest.query_expansion_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec
-	11, // 7: google.cloud.discoveryengine.v1alpha.SearchRequest.spell_correction_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec
-	12, // 8: google.cloud.discoveryengine.v1alpha.SearchRequest.content_search_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec
-	13, // 9: google.cloud.discoveryengine.v1alpha.SearchRequest.embedding_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec
-	15, // 10: google.cloud.discoveryengine.v1alpha.SearchRequest.user_labels:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.UserLabelsEntry
-	40, // 11: google.cloud.discoveryengine.v1alpha.SearchRequest.custom_fine_tuning_spec:type_name -> google.cloud.discoveryengine.v1alpha.CustomFineTuningSpec
-	24, // 12: google.cloud.discoveryengine.v1alpha.SearchResponse.results:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult
-	25, // 13: google.cloud.discoveryengine.v1alpha.SearchResponse.facets:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Facet
-	26, // 14: google.cloud.discoveryengine.v1alpha.SearchResponse.guided_search_result:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult
-	27, // 15: google.cloud.discoveryengine.v1alpha.SearchResponse.summary:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary
-	28, // 16: google.cloud.discoveryengine.v1alpha.SearchResponse.geo_search_debug_info:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.GeoSearchDebugInfo
-	29, // 17: google.cloud.discoveryengine.v1alpha.SearchResponse.query_expansion_info:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.QueryExpansionInfo
-	16, // 18: google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec.facet_key:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec.FacetKey
-	17, // 19: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.condition_boost_specs:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec
-	0,  // 20: google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec.condition:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec.Condition
-	1,  // 21: google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec.mode:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec.Mode
-	18, // 22: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.snippet_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SnippetSpec
-	19, // 23: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.summary_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec
-	20, // 24: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.extractive_content_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.ExtractiveContentSpec
-	2,  // 25: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.search_result_mode:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SearchResultMode
-	23, // 26: google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec.embedding_vectors:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec.EmbeddingVector
-	41, // 27: google.cloud.discoveryengine.v1alpha.SearchRequest.ParamsEntry.value:type_name -> google.protobuf.Value
-	42, // 28: google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec.FacetKey.intervals:type_name -> google.cloud.discoveryengine.v1alpha.Interval
-	21, // 29: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.model_prompt_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.ModelPromptSpec
-	22, // 30: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.model_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.ModelSpec
-	43, // 31: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.document:type_name -> google.cloud.discoveryengine.v1alpha.Document
-	44, // 32: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.chunk:type_name -> google.cloud.discoveryengine.v1alpha.Chunk
-	30, // 33: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.model_scores:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.ModelScoresEntry
-	31, // 34: google.cloud.discoveryengine.v1alpha.SearchResponse.Facet.values:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Facet.FacetValue
-	32, // 35: google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult.refinement_attributes:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult.RefinementAttribute
-	3,  // 36: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.summary_skipped_reasons:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummarySkippedReason
-	33, // 37: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.safety_attributes:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SafetyAttributes
-	38, // 38: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.summary_with_metadata:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummaryWithMetadata
-	45, // 39: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.ModelScoresEntry.value:type_name -> google.cloud.discoveryengine.v1alpha.DoubleList
-	42, // 40: google.cloud.discoveryengine.v1alpha.SearchResponse.Facet.FacetValue.interval:type_name -> google.cloud.discoveryengine.v1alpha.Interval
-	35, // 41: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationMetadata.citations:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Citation
-	36, // 42: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Citation.sources:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationSource
-	34, // 43: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummaryWithMetadata.citation_metadata:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationMetadata
-	37, // 44: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummaryWithMetadata.references:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Reference
-	4,  // 45: google.cloud.discoveryengine.v1alpha.SearchService.Search:input_type -> google.cloud.discoveryengine.v1alpha.SearchRequest
-	5,  // 46: google.cloud.discoveryengine.v1alpha.SearchService.Search:output_type -> google.cloud.discoveryengine.v1alpha.SearchResponse
-	46, // [46:47] is the sub-list for method output_type
-	45, // [45:46] is the sub-list for method input_type
-	45, // [45:45] is the sub-list for extension type_name
-	45, // [45:45] is the sub-list for extension extendee
-	0,  // [0:45] is the sub-list for field type_name
+	8,  // 0: google.cloud.discoveryengine.v1alpha.SearchRequest.image_query:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ImageQuery
+	9,  // 1: google.cloud.discoveryengine.v1alpha.SearchRequest.data_store_specs:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.DataStoreSpec
+	45, // 2: google.cloud.discoveryengine.v1alpha.SearchRequest.user_info:type_name -> google.cloud.discoveryengine.v1alpha.UserInfo
+	10, // 3: google.cloud.discoveryengine.v1alpha.SearchRequest.facet_specs:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec
+	11, // 4: google.cloud.discoveryengine.v1alpha.SearchRequest.boost_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec
+	16, // 5: google.cloud.discoveryengine.v1alpha.SearchRequest.params:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ParamsEntry
+	12, // 6: google.cloud.discoveryengine.v1alpha.SearchRequest.query_expansion_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec
+	13, // 7: google.cloud.discoveryengine.v1alpha.SearchRequest.spell_correction_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec
+	14, // 8: google.cloud.discoveryengine.v1alpha.SearchRequest.content_search_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec
+	15, // 9: google.cloud.discoveryengine.v1alpha.SearchRequest.embedding_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec
+	17, // 10: google.cloud.discoveryengine.v1alpha.SearchRequest.user_labels:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.UserLabelsEntry
+	46, // 11: google.cloud.discoveryengine.v1alpha.SearchRequest.custom_fine_tuning_spec:type_name -> google.cloud.discoveryengine.v1alpha.CustomFineTuningSpec
+	29, // 12: google.cloud.discoveryengine.v1alpha.SearchResponse.results:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult
+	30, // 13: google.cloud.discoveryengine.v1alpha.SearchResponse.facets:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Facet
+	31, // 14: google.cloud.discoveryengine.v1alpha.SearchResponse.guided_search_result:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult
+	32, // 15: google.cloud.discoveryengine.v1alpha.SearchResponse.summary:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary
+	33, // 16: google.cloud.discoveryengine.v1alpha.SearchResponse.geo_search_debug_info:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.GeoSearchDebugInfo
+	34, // 17: google.cloud.discoveryengine.v1alpha.SearchResponse.query_expansion_info:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.QueryExpansionInfo
+	18, // 18: google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec.facet_key:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec.FacetKey
+	19, // 19: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.condition_boost_specs:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec
+	2,  // 20: google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec.condition:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.QueryExpansionSpec.Condition
+	3,  // 21: google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec.mode:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.SpellCorrectionSpec.Mode
+	22, // 22: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.snippet_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SnippetSpec
+	23, // 23: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.summary_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec
+	24, // 24: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.extractive_content_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.ExtractiveContentSpec
+	4,  // 25: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.search_result_mode:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SearchResultMode
+	25, // 26: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.chunk_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.ChunkSpec
+	28, // 27: google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec.embedding_vectors:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.EmbeddingSpec.EmbeddingVector
+	47, // 28: google.cloud.discoveryengine.v1alpha.SearchRequest.ParamsEntry.value:type_name -> google.protobuf.Value
+	48, // 29: google.cloud.discoveryengine.v1alpha.SearchRequest.FacetSpec.FacetKey.intervals:type_name -> google.cloud.discoveryengine.v1alpha.Interval
+	20, // 30: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.boost_control_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec
+	0,  // 31: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec.attribute_type:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec.AttributeType
+	1,  // 32: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec.interpolation_type:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec.InterpolationType
+	21, // 33: google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec.control_points:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.BoostSpec.ConditionBoostSpec.BoostControlSpec.ControlPoint
+	26, // 34: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.model_prompt_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.ModelPromptSpec
+	27, // 35: google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.model_spec:type_name -> google.cloud.discoveryengine.v1alpha.SearchRequest.ContentSearchSpec.SummarySpec.ModelSpec
+	49, // 36: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.document:type_name -> google.cloud.discoveryengine.v1alpha.Document
+	50, // 37: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.chunk:type_name -> google.cloud.discoveryengine.v1alpha.Chunk
+	35, // 38: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.model_scores:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.ModelScoresEntry
+	36, // 39: google.cloud.discoveryengine.v1alpha.SearchResponse.Facet.values:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Facet.FacetValue
+	37, // 40: google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult.refinement_attributes:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.GuidedSearchResult.RefinementAttribute
+	5,  // 41: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.summary_skipped_reasons:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummarySkippedReason
+	38, // 42: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.safety_attributes:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SafetyAttributes
+	43, // 43: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.summary_with_metadata:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummaryWithMetadata
+	51, // 44: google.cloud.discoveryengine.v1alpha.SearchResponse.SearchResult.ModelScoresEntry.value:type_name -> google.cloud.discoveryengine.v1alpha.DoubleList
+	48, // 45: google.cloud.discoveryengine.v1alpha.SearchResponse.Facet.FacetValue.interval:type_name -> google.cloud.discoveryengine.v1alpha.Interval
+	40, // 46: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationMetadata.citations:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Citation
+	41, // 47: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Citation.sources:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationSource
+	44, // 48: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Reference.chunk_contents:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Reference.ChunkContent
+	39, // 49: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummaryWithMetadata.citation_metadata:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.CitationMetadata
+	42, // 50: google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.SummaryWithMetadata.references:type_name -> google.cloud.discoveryengine.v1alpha.SearchResponse.Summary.Reference
+	6,  // 51: google.cloud.discoveryengine.v1alpha.SearchService.Search:input_type -> google.cloud.discoveryengine.v1alpha.SearchRequest
+	7,  // 52: google.cloud.discoveryengine.v1alpha.SearchService.Search:output_type -> google.cloud.discoveryengine.v1alpha.SearchResponse
+	52, // [52:53] is the sub-list for method output_type
+	51, // [51:52] is the sub-list for method input_type
+	51, // [51:51] is the sub-list for extension type_name
+	51, // [51:51] is the sub-list for extension extendee
+	0,  // [0:51] is the sub-list for field type_name
 }
 
 func init() { file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() }
@@ -3992,7 +4533,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchRequest_ContentSearchSpec_SnippetSpec); i {
+			switch v := v.(*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4004,7 +4545,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchRequest_ContentSearchSpec_SummarySpec); i {
+			switch v := v.(*SearchRequest_BoostSpec_ConditionBoostSpec_BoostControlSpec_ControlPoint); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4016,7 +4557,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchRequest_ContentSearchSpec_ExtractiveContentSpec); i {
+			switch v := v.(*SearchRequest_ContentSearchSpec_SnippetSpec); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4028,7 +4569,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec); i {
+			switch v := v.(*SearchRequest_ContentSearchSpec_SummarySpec); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4040,7 +4581,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec); i {
+			switch v := v.(*SearchRequest_ContentSearchSpec_ExtractiveContentSpec); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4052,7 +4593,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchRequest_EmbeddingSpec_EmbeddingVector); i {
+			switch v := v.(*SearchRequest_ContentSearchSpec_ChunkSpec); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4064,7 +4605,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchResponse_SearchResult); i {
+			switch v := v.(*SearchRequest_ContentSearchSpec_SummarySpec_ModelPromptSpec); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4076,7 +4617,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[21].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchResponse_Facet); i {
+			switch v := v.(*SearchRequest_ContentSearchSpec_SummarySpec_ModelSpec); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4088,7 +4629,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[22].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchResponse_GuidedSearchResult); i {
+			switch v := v.(*SearchRequest_EmbeddingSpec_EmbeddingVector); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4100,7 +4641,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[23].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchResponse_Summary); i {
+			switch v := v.(*SearchResponse_SearchResult); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4112,7 +4653,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchResponse_GeoSearchDebugInfo); i {
+			switch v := v.(*SearchResponse_Facet); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4124,7 +4665,19 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchResponse_QueryExpansionInfo); i {
+			switch v := v.(*SearchResponse_GuidedSearchResult); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SearchResponse_Summary); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4136,7 +4689,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[27].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SearchResponse_Facet_FacetValue); i {
+			switch v := v.(*SearchResponse_GeoSearchDebugInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -4148,6 +4701,30 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 			}
 		}
 		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[28].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SearchResponse_QueryExpansionInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SearchResponse_Facet_FacetValue); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SearchResponse_GuidedSearchResult_RefinementAttribute); i {
 			case 0:
 				return &v.state
@@ -4159,7 +4736,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 				return nil
 			}
 		}
-		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[29].Exporter = func(v interface{}, i int) interface{} {
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SearchResponse_Summary_SafetyAttributes); i {
 			case 0:
 				return &v.state
@@ -4171,7 +4748,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 				return nil
 			}
 		}
-		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SearchResponse_Summary_CitationMetadata); i {
 			case 0:
 				return &v.state
@@ -4183,7 +4760,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 				return nil
 			}
 		}
-		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SearchResponse_Summary_Citation); i {
 			case 0:
 				return &v.state
@@ -4195,7 +4772,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 				return nil
 			}
 		}
-		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[35].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SearchResponse_Summary_CitationSource); i {
 			case 0:
 				return &v.state
@@ -4207,7 +4784,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 				return nil
 			}
 		}
-		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[33].Exporter = func(v interface{}, i int) interface{} {
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[36].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SearchResponse_Summary_Reference); i {
 			case 0:
 				return &v.state
@@ -4219,7 +4796,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 				return nil
 			}
 		}
-		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[34].Exporter = func(v interface{}, i int) interface{} {
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[37].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*SearchResponse_Summary_SummaryWithMetadata); i {
 			case 0:
 				return &v.state
@@ -4231,11 +4808,23 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 				return nil
 			}
 		}
+		file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[38].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*SearchResponse_Summary_Reference_ChunkContent); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[2].OneofWrappers = []interface{}{
 		(*SearchRequest_ImageQuery_ImageBytes)(nil),
 	}
-	file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[27].OneofWrappers = []interface{}{
+	file_google_cloud_discoveryengine_v1alpha_search_service_proto_msgTypes[30].OneofWrappers = []interface{}{
 		(*SearchResponse_Facet_FacetValue_Value)(nil),
 		(*SearchResponse_Facet_FacetValue_Interval)(nil),
 	}
@@ -4244,8 +4833,8 @@ func file_google_cloud_discoveryengine_v1alpha_search_service_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_cloud_discoveryengine_v1alpha_search_service_proto_rawDesc,
-			NumEnums:      4,
-			NumMessages:   35,
+			NumEnums:      6,
+			NumMessages:   39,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/discoveryengine/apiv1alpha/discoveryenginepb/search_tuning_service.pb.go b/discoveryengine/apiv1alpha/discoveryenginepb/search_tuning_service.pb.go
index d8538a09c6b9..b2727ae5c648 100755
--- a/discoveryengine/apiv1alpha/discoveryenginepb/search_tuning_service.pb.go
+++ b/discoveryengine/apiv1alpha/discoveryenginepb/search_tuning_service.pb.go
@@ -167,6 +167,8 @@ type TrainCustomModelResponse struct {
 	//   - **in-progress**: Model training is in progress.
 	//   - **ready**: The model is ready for serving.
 	ModelStatus string `protobuf:"bytes,3,opt,name=model_status,json=modelStatus,proto3" json:"model_status,omitempty"`
+	// The metrics of the trained model.
+	Metrics map[string]float64 `protobuf:"bytes,4,rep,name=metrics,proto3" json:"metrics,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"fixed64,2,opt,name=value,proto3"`
 }
 
 func (x *TrainCustomModelResponse) Reset() {
@@ -222,6 +224,13 @@ func (x *TrainCustomModelResponse) GetModelStatus() string {
 	return ""
 }
 
+func (x *TrainCustomModelResponse) GetMetrics() map[string]float64 {
+	if x != nil {
+		return x.Metrics
+	}
+	return nil
+}
+
 // Metadata related to the progress of the TrainCustomModel operation. This is
 // returned by the google.longrunning.Operation.metadata field.
 type TrainCustomModelMetadata struct {
@@ -293,8 +302,8 @@ type TrainCustomModelRequest_GcsTrainingInput struct {
 	// A newline delimited jsonl/ndjson file.
 	//
 	// For search-tuning model, each line should have the _id, title
-	// and text. Example: {"_id": "doc1", title: "relevant doc", "text":
-	// "relevant text"}
+	// and text. Example:
+	// `{"_id": "doc1", title: "relevant doc", "text": "relevant text"}`
 	CorpusDataPath string `protobuf:"bytes,1,opt,name=corpus_data_path,json=corpusDataPath,proto3" json:"corpus_data_path,omitempty"`
 	// The gcs query data which could be associated in train data.
 	// The data path format is `gs://<bucket_to_data>/<jsonl_file_name>`.
@@ -440,7 +449,7 @@ var file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_rawDes
 	0x65, 0x73, 0x74, 0x5f, 0x64, 0x61, 0x74, 0x61, 0x5f, 0x70, 0x61, 0x74, 0x68, 0x18, 0x04, 0x20,
 	0x01, 0x28, 0x09, 0x52, 0x0c, 0x74, 0x65, 0x73, 0x74, 0x44, 0x61, 0x74, 0x61, 0x50, 0x61, 0x74,
 	0x68, 0x42, 0x10, 0x0a, 0x0e, 0x74, 0x72, 0x61, 0x69, 0x6e, 0x69, 0x6e, 0x67, 0x5f, 0x69, 0x6e,
-	0x70, 0x75, 0x74, 0x22, 0xd2, 0x01, 0x0a, 0x18, 0x54, 0x72, 0x61, 0x69, 0x6e, 0x43, 0x75, 0x73,
+	0x70, 0x75, 0x74, 0x22, 0xf5, 0x02, 0x0a, 0x18, 0x54, 0x72, 0x61, 0x69, 0x6e, 0x43, 0x75, 0x73,
 	0x74, 0x6f, 0x6d, 0x4d, 0x6f, 0x64, 0x65, 0x6c, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65,
 	0x12, 0x37, 0x0a, 0x0d, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x5f, 0x73, 0x61, 0x6d, 0x70, 0x6c, 0x65,
 	0x73, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x12, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65,
@@ -453,64 +462,74 @@ var file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_rawDes
 	0x6f, 0x72, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x0b, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x43,
 	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x21, 0x0a, 0x0c, 0x6d, 0x6f, 0x64, 0x65, 0x6c, 0x5f, 0x73,
 	0x74, 0x61, 0x74, 0x75, 0x73, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x6d, 0x6f, 0x64,
-	0x65, 0x6c, 0x53, 0x74, 0x61, 0x74, 0x75, 0x73, 0x22, 0x94, 0x01, 0x0a, 0x18, 0x54, 0x72, 0x61,
-	0x69, 0x6e, 0x43, 0x75, 0x73, 0x74, 0x6f, 0x6d, 0x4d, 0x6f, 0x64, 0x65, 0x6c, 0x4d, 0x65, 0x74,
-	0x61, 0x64, 0x61, 0x74, 0x61, 0x12, 0x3b, 0x0a, 0x0b, 0x63, 0x72, 0x65, 0x61, 0x74, 0x65, 0x5f,
-	0x74, 0x69, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x67, 0x6f, 0x6f,
+	0x65, 0x6c, 0x53, 0x74, 0x61, 0x74, 0x75, 0x73, 0x12, 0x65, 0x0a, 0x07, 0x6d, 0x65, 0x74, 0x72,
+	0x69, 0x63, 0x73, 0x18, 0x04, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x4b, 0x2e, 0x67, 0x6f, 0x6f, 0x67,
+	0x6c, 0x65, 0x2e, 0x63, 0x6c, 0x6f, 0x75, 0x64, 0x2e, 0x64, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65,
+	0x72, 0x79, 0x65, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x2e, 0x76, 0x31, 0x61, 0x6c, 0x70, 0x68, 0x61,
+	0x2e, 0x54, 0x72, 0x61, 0x69, 0x6e, 0x43, 0x75, 0x73, 0x74, 0x6f, 0x6d, 0x4d, 0x6f, 0x64, 0x65,
+	0x6c, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x2e, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63,
+	0x73, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x07, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x1a,
+	0x3a, 0x0a, 0x0c, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12,
+	0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6b, 0x65,
+	0x79, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x01,
+	0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38, 0x01, 0x22, 0x94, 0x01, 0x0a, 0x18,
+	0x54, 0x72, 0x61, 0x69, 0x6e, 0x43, 0x75, 0x73, 0x74, 0x6f, 0x6d, 0x4d, 0x6f, 0x64, 0x65, 0x6c,
+	0x4d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61, 0x12, 0x3b, 0x0a, 0x0b, 0x63, 0x72, 0x65, 0x61,
+	0x74, 0x65, 0x5f, 0x74, 0x69, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1a, 0x2e,
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 }
 
 var (
@@ -525,31 +544,33 @@ func file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_rawDe
 	return file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_rawDescData
 }
 
-var file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
 var file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_goTypes = []interface{}{
 	(*TrainCustomModelRequest)(nil),                  // 0: google.cloud.discoveryengine.v1alpha.TrainCustomModelRequest
 	(*TrainCustomModelResponse)(nil),                 // 1: google.cloud.discoveryengine.v1alpha.TrainCustomModelResponse
 	(*TrainCustomModelMetadata)(nil),                 // 2: google.cloud.discoveryengine.v1alpha.TrainCustomModelMetadata
 	(*TrainCustomModelRequest_GcsTrainingInput)(nil), // 3: google.cloud.discoveryengine.v1alpha.TrainCustomModelRequest.GcsTrainingInput
-	(*ImportErrorConfig)(nil),                        // 4: google.cloud.discoveryengine.v1alpha.ImportErrorConfig
-	(*status.Status)(nil),                            // 5: google.rpc.Status
-	(*timestamppb.Timestamp)(nil),                    // 6: google.protobuf.Timestamp
-	(*longrunningpb.Operation)(nil),                  // 7: google.longrunning.Operation
+	nil,                             // 4: google.cloud.discoveryengine.v1alpha.TrainCustomModelResponse.MetricsEntry
+	(*ImportErrorConfig)(nil),       // 5: google.cloud.discoveryengine.v1alpha.ImportErrorConfig
+	(*status.Status)(nil),           // 6: google.rpc.Status
+	(*timestamppb.Timestamp)(nil),   // 7: google.protobuf.Timestamp
+	(*longrunningpb.Operation)(nil), // 8: google.longrunning.Operation
 }
 var file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_depIdxs = []int32{
 	3, // 0: google.cloud.discoveryengine.v1alpha.TrainCustomModelRequest.gcs_training_input:type_name -> google.cloud.discoveryengine.v1alpha.TrainCustomModelRequest.GcsTrainingInput
-	4, // 1: google.cloud.discoveryengine.v1alpha.TrainCustomModelRequest.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
-	5, // 2: google.cloud.discoveryengine.v1alpha.TrainCustomModelResponse.error_samples:type_name -> google.rpc.Status
-	4, // 3: google.cloud.discoveryengine.v1alpha.TrainCustomModelResponse.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
-	6, // 4: google.cloud.discoveryengine.v1alpha.TrainCustomModelMetadata.create_time:type_name -> google.protobuf.Timestamp
-	6, // 5: google.cloud.discoveryengine.v1alpha.TrainCustomModelMetadata.update_time:type_name -> google.protobuf.Timestamp
-	0, // 6: google.cloud.discoveryengine.v1alpha.SearchTuningService.TrainCustomModel:input_type -> google.cloud.discoveryengine.v1alpha.TrainCustomModelRequest
-	7, // 7: google.cloud.discoveryengine.v1alpha.SearchTuningService.TrainCustomModel:output_type -> google.longrunning.Operation
-	7, // [7:8] is the sub-list for method output_type
-	6, // [6:7] is the sub-list for method input_type
-	6, // [6:6] is the sub-list for extension type_name
-	6, // [6:6] is the sub-list for extension extendee
-	0, // [0:6] is the sub-list for field type_name
+	5, // 1: google.cloud.discoveryengine.v1alpha.TrainCustomModelRequest.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
+	6, // 2: google.cloud.discoveryengine.v1alpha.TrainCustomModelResponse.error_samples:type_name -> google.rpc.Status
+	5, // 3: google.cloud.discoveryengine.v1alpha.TrainCustomModelResponse.error_config:type_name -> google.cloud.discoveryengine.v1alpha.ImportErrorConfig
+	4, // 4: google.cloud.discoveryengine.v1alpha.TrainCustomModelResponse.metrics:type_name -> google.cloud.discoveryengine.v1alpha.TrainCustomModelResponse.MetricsEntry
+	7, // 5: google.cloud.discoveryengine.v1alpha.TrainCustomModelMetadata.create_time:type_name -> google.protobuf.Timestamp
+	7, // 6: google.cloud.discoveryengine.v1alpha.TrainCustomModelMetadata.update_time:type_name -> google.protobuf.Timestamp
+	0, // 7: google.cloud.discoveryengine.v1alpha.SearchTuningService.TrainCustomModel:input_type -> google.cloud.discoveryengine.v1alpha.TrainCustomModelRequest
+	8, // 8: google.cloud.discoveryengine.v1alpha.SearchTuningService.TrainCustomModel:output_type -> google.longrunning.Operation
+	8, // [8:9] is the sub-list for method output_type
+	7, // [7:8] is the sub-list for method input_type
+	7, // [7:7] is the sub-list for extension type_name
+	7, // [7:7] is the sub-list for extension extendee
+	0, // [0:7] is the sub-list for field type_name
 }
 
 func init() { file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_init() }
@@ -617,7 +638,7 @@ func file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_init(
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_cloud_discoveryengine_v1alpha_search_tuning_service_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   4,
+			NumMessages:   5,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/discoveryengine/apiv1alpha/document_client.go b/discoveryengine/apiv1alpha/document_client.go
index d146b8048776..23aa1efed604 100755
--- a/discoveryengine/apiv1alpha/document_client.go
+++ b/discoveryengine/apiv1alpha/document_client.go
@@ -47,15 +47,16 @@ var newDocumentClientHook clientHook
 
 // DocumentCallOptions contains the retry settings for each method of DocumentClient.
 type DocumentCallOptions struct {
-	GetDocument     []gax.CallOption
-	ListDocuments   []gax.CallOption
-	CreateDocument  []gax.CallOption
-	UpdateDocument  []gax.CallOption
-	DeleteDocument  []gax.CallOption
-	ImportDocuments []gax.CallOption
-	PurgeDocuments  []gax.CallOption
-	GetOperation    []gax.CallOption
-	ListOperations  []gax.CallOption
+	GetDocument          []gax.CallOption
+	ListDocuments        []gax.CallOption
+	CreateDocument       []gax.CallOption
+	UpdateDocument       []gax.CallOption
+	DeleteDocument       []gax.CallOption
+	ImportDocuments      []gax.CallOption
+	PurgeDocuments       []gax.CallOption
+	GetProcessedDocument []gax.CallOption
+	GetOperation         []gax.CallOption
+	ListOperations       []gax.CallOption
 }
 
 func defaultDocumentGRPCClientOptions() []option.ClientOption {
@@ -158,6 +159,18 @@ func defaultDocumentCallOptions() *DocumentCallOptions {
 				})
 			}),
 		},
+		GetProcessedDocument: []gax.CallOption{
+			gax.WithTimeout(30000 * time.Millisecond),
+			gax.WithRetry(func() gax.Retryer {
+				return gax.OnCodes([]codes.Code{
+					codes.Unavailable,
+				}, gax.Backoff{
+					Initial:    1000 * time.Millisecond,
+					Max:        10000 * time.Millisecond,
+					Multiplier: 1.30,
+				})
+			}),
+		},
 		GetOperation: []gax.CallOption{
 			gax.WithTimeout(30000 * time.Millisecond),
 			gax.WithRetry(func() gax.Retryer {
@@ -264,6 +277,17 @@ func defaultDocumentRESTCallOptions() *DocumentCallOptions {
 					http.StatusServiceUnavailable)
 			}),
 		},
+		GetProcessedDocument: []gax.CallOption{
+			gax.WithTimeout(30000 * time.Millisecond),
+			gax.WithRetry(func() gax.Retryer {
+				return gax.OnHTTPCodes(gax.Backoff{
+					Initial:    1000 * time.Millisecond,
+					Max:        10000 * time.Millisecond,
+					Multiplier: 1.30,
+				},
+					http.StatusServiceUnavailable)
+			}),
+		},
 		GetOperation: []gax.CallOption{
 			gax.WithTimeout(30000 * time.Millisecond),
 			gax.WithRetry(func() gax.Retryer {
@@ -303,6 +327,7 @@ type internalDocumentClient interface {
 	ImportDocumentsOperation(name string) *ImportDocumentsOperation
 	PurgeDocuments(context.Context, *discoveryenginepb.PurgeDocumentsRequest, ...gax.CallOption) (*PurgeDocumentsOperation, error)
 	PurgeDocumentsOperation(name string) *PurgeDocumentsOperation
+	GetProcessedDocument(context.Context, *discoveryenginepb.GetProcessedDocumentRequest, ...gax.CallOption) (*discoveryenginepb.ProcessedDocument, error)
 	GetOperation(context.Context, *longrunningpb.GetOperationRequest, ...gax.CallOption) (*longrunningpb.Operation, error)
 	ListOperations(context.Context, *longrunningpb.ListOperationsRequest, ...gax.CallOption) *OperationIterator
 }
@@ -418,6 +443,12 @@ func (c *DocumentClient) PurgeDocumentsOperation(name string) *PurgeDocumentsOpe
 	return c.internalClient.PurgeDocumentsOperation(name)
 }
 
+// GetProcessedDocument gets the parsed layout information for a
+// Document.
+func (c *DocumentClient) GetProcessedDocument(ctx context.Context, req *discoveryenginepb.GetProcessedDocumentRequest, opts ...gax.CallOption) (*discoveryenginepb.ProcessedDocument, error) {
+	return c.internalClient.GetProcessedDocument(ctx, req, opts...)
+}
+
 // GetOperation is a utility method from google.longrunning.Operations.
 func (c *DocumentClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
 	return c.internalClient.GetOperation(ctx, req, opts...)
@@ -762,6 +793,24 @@ func (c *documentGRPCClient) PurgeDocuments(ctx context.Context, req *discoverye
 	}, nil
 }
 
+func (c *documentGRPCClient) GetProcessedDocument(ctx context.Context, req *discoveryenginepb.GetProcessedDocumentRequest, opts ...gax.CallOption) (*discoveryenginepb.ProcessedDocument, error) {
+	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}
+
+	hds = append(c.xGoogHeaders, hds...)
+	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
+	opts = append((*c.CallOptions).GetProcessedDocument[0:len((*c.CallOptions).GetProcessedDocument):len((*c.CallOptions).GetProcessedDocument)], opts...)
+	var resp *discoveryenginepb.ProcessedDocument
+	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+		var err error
+		resp, err = c.documentClient.GetProcessedDocument(ctx, req, settings.GRPC...)
+		return err
+	}, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
+
 func (c *documentGRPCClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
 	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}
 
@@ -1324,6 +1373,71 @@ func (c *documentRESTClient) PurgeDocuments(ctx context.Context, req *discoverye
 	}, nil
 }
 
+// GetProcessedDocument gets the parsed layout information for a
+// Document.
+func (c *documentRESTClient) GetProcessedDocument(ctx context.Context, req *discoveryenginepb.GetProcessedDocumentRequest, opts ...gax.CallOption) (*discoveryenginepb.ProcessedDocument, error) {
+	baseUrl, err := url.Parse(c.endpoint)
+	if err != nil {
+		return nil, err
+	}
+	baseUrl.Path += fmt.Sprintf("/v1alpha/%v:getProcessedDocument", req.GetName())
+
+	params := url.Values{}
+	params.Add("$alt", "json;enum-encoding=int")
+	if req.GetProcessedDocumentFormat() != 0 {
+		params.Add("processedDocumentFormat", fmt.Sprintf("%v", req.GetProcessedDocumentFormat()))
+	}
+	params.Add("processedDocumentType", fmt.Sprintf("%v", req.GetProcessedDocumentType()))
+
+	baseUrl.RawQuery = params.Encode()
+
+	// Build HTTP headers from client and context metadata.
+	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}
+
+	hds = append(c.xGoogHeaders, hds...)
+	hds = append(hds, "Content-Type", "application/json")
+	headers := gax.BuildHeaders(ctx, hds...)
+	opts = append((*c.CallOptions).GetProcessedDocument[0:len((*c.CallOptions).GetProcessedDocument):len((*c.CallOptions).GetProcessedDocument)], opts...)
+	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
+	resp := &discoveryenginepb.ProcessedDocument{}
+	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+		if settings.Path != "" {
+			baseUrl.Path = settings.Path
+		}
+		httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
+		if err != nil {
+			return err
+		}
+		httpReq = httpReq.WithContext(ctx)
+		httpReq.Header = headers
+
+		httpRsp, err := c.httpClient.Do(httpReq)
+		if err != nil {
+			return err
+		}
+		defer httpRsp.Body.Close()
+
+		if err = googleapi.CheckResponse(httpRsp); err != nil {
+			return err
+		}
+
+		buf, err := io.ReadAll(httpRsp.Body)
+		if err != nil {
+			return err
+		}
+
+		if err := unm.Unmarshal(buf, resp); err != nil {
+			return err
+		}
+
+		return nil
+	}, opts...)
+	if e != nil {
+		return nil, e
+	}
+	return resp, nil
+}
+
 // GetOperation is a utility method from google.longrunning.Operations.
 func (c *documentRESTClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
 	baseUrl, err := url.Parse(c.endpoint)
diff --git a/discoveryengine/apiv1alpha/document_client_example_test.go b/discoveryengine/apiv1alpha/document_client_example_test.go
index ab5615dc0f2c..2ce47d000d1e 100644
--- a/discoveryengine/apiv1alpha/document_client_example_test.go
+++ b/discoveryengine/apiv1alpha/document_client_example_test.go
@@ -132,6 +132,31 @@ func ExampleDocumentClient_GetDocument() {
 	_ = resp
 }
 
+func ExampleDocumentClient_GetProcessedDocument() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewDocumentClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &discoveryenginepb.GetProcessedDocumentRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/cloud.google.com/go/discoveryengine/apiv1alpha/discoveryenginepb#GetProcessedDocumentRequest.
+	}
+	resp, err := c.GetProcessedDocument(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	// TODO: Use resp.
+	_ = resp
+}
+
 func ExampleDocumentClient_ImportDocuments() {
 	ctx := context.Background()
 	// This snippet has been automatically generated and should be regarded as a code template only.
diff --git a/discoveryengine/apiv1alpha/gapic_metadata.json b/discoveryengine/apiv1alpha/gapic_metadata.json
index ff853cd29452..34e6bdb8b666 100644
--- a/discoveryengine/apiv1alpha/gapic_metadata.json
+++ b/discoveryengine/apiv1alpha/gapic_metadata.json
@@ -400,6 +400,11 @@
                 "GetOperation"
               ]
             },
+            "GetProcessedDocument": {
+              "methods": [
+                "GetProcessedDocument"
+              ]
+            },
             "ImportDocuments": {
               "methods": [
                 "ImportDocuments"
@@ -450,6 +455,11 @@
                 "GetOperation"
               ]
             },
+            "GetProcessedDocument": {
+              "methods": [
+                "GetProcessedDocument"
+              ]
+            },
             "ImportDocuments": {
               "methods": [
                 "ImportDocuments"
@@ -637,6 +647,50 @@
         }
       }
     },
+    "RankService": {
+      "clients": {
+        "grpc": {
+          "libraryClient": "RankClient",
+          "rpcs": {
+            "GetOperation": {
+              "methods": [
+                "GetOperation"
+              ]
+            },
+            "ListOperations": {
+              "methods": [
+                "ListOperations"
+              ]
+            },
+            "Rank": {
+              "methods": [
+                "Rank"
+              ]
+            }
+          }
+        },
+        "rest": {
+          "libraryClient": "RankClient",
+          "rpcs": {
+            "GetOperation": {
+              "methods": [
+                "GetOperation"
+              ]
+            },
+            "ListOperations": {
+              "methods": [
+                "ListOperations"
+              ]
+            },
+            "Rank": {
+              "methods": [
+                "Rank"
+              ]
+            }
+          }
+        }
+      }
+    },
     "RecommendationService": {
       "clients": {
         "grpc": {
diff --git a/discoveryengine/apiv1alpha/rank_client.go b/discoveryengine/apiv1alpha/rank_client.go
new file mode 100755
index 000000000000..4d91a2fa05b6
--- /dev/null
+++ b/discoveryengine/apiv1alpha/rank_client.go
@@ -0,0 +1,628 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
+
+package discoveryengine
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"math"
+	"net/http"
+	"net/url"
+	"time"
+
+	discoveryenginepb "cloud.google.com/go/discoveryengine/apiv1alpha/discoveryenginepb"
+	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
+	gax "github.com/googleapis/gax-go/v2"
+	"google.golang.org/api/googleapi"
+	"google.golang.org/api/iterator"
+	"google.golang.org/api/option"
+	"google.golang.org/api/option/internaloption"
+	gtransport "google.golang.org/api/transport/grpc"
+	httptransport "google.golang.org/api/transport/http"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/proto"
+)
+
+var newRankClientHook clientHook
+
+// RankCallOptions contains the retry settings for each method of RankClient.
+type RankCallOptions struct {
+	Rank           []gax.CallOption
+	GetOperation   []gax.CallOption
+	ListOperations []gax.CallOption
+}
+
+func defaultRankGRPCClientOptions() []option.ClientOption {
+	return []option.ClientOption{
+		internaloption.WithDefaultEndpoint("discoveryengine.googleapis.com:443"),
+		internaloption.WithDefaultEndpointTemplate("discoveryengine.UNIVERSE_DOMAIN:443"),
+		internaloption.WithDefaultMTLSEndpoint("discoveryengine.mtls.googleapis.com:443"),
+		internaloption.WithDefaultUniverseDomain("googleapis.com"),
+		internaloption.WithDefaultAudience("https://discoveryengine.googleapis.com/"),
+		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
+		internaloption.EnableJwtWithScope(),
+		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
+			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
+	}
+}
+
+func defaultRankCallOptions() *RankCallOptions {
+	return &RankCallOptions{
+		Rank: []gax.CallOption{},
+		GetOperation: []gax.CallOption{
+			gax.WithTimeout(30000 * time.Millisecond),
+			gax.WithRetry(func() gax.Retryer {
+				return gax.OnCodes([]codes.Code{
+					codes.Unavailable,
+				}, gax.Backoff{
+					Initial:    1000 * time.Millisecond,
+					Max:        10000 * time.Millisecond,
+					Multiplier: 1.30,
+				})
+			}),
+		},
+		ListOperations: []gax.CallOption{
+			gax.WithTimeout(300000 * time.Millisecond),
+			gax.WithRetry(func() gax.Retryer {
+				return gax.OnCodes([]codes.Code{
+					codes.Unavailable,
+				}, gax.Backoff{
+					Initial:    1000 * time.Millisecond,
+					Max:        30000 * time.Millisecond,
+					Multiplier: 1.30,
+				})
+			}),
+		},
+	}
+}
+
+func defaultRankRESTCallOptions() *RankCallOptions {
+	return &RankCallOptions{
+		Rank: []gax.CallOption{},
+		GetOperation: []gax.CallOption{
+			gax.WithTimeout(30000 * time.Millisecond),
+			gax.WithRetry(func() gax.Retryer {
+				return gax.OnHTTPCodes(gax.Backoff{
+					Initial:    1000 * time.Millisecond,
+					Max:        10000 * time.Millisecond,
+					Multiplier: 1.30,
+				},
+					http.StatusServiceUnavailable)
+			}),
+		},
+		ListOperations: []gax.CallOption{
+			gax.WithTimeout(300000 * time.Millisecond),
+			gax.WithRetry(func() gax.Retryer {
+				return gax.OnHTTPCodes(gax.Backoff{
+					Initial:    1000 * time.Millisecond,
+					Max:        30000 * time.Millisecond,
+					Multiplier: 1.30,
+				},
+					http.StatusServiceUnavailable)
+			}),
+		},
+	}
+}
+
+// internalRankClient is an interface that defines the methods available from Discovery Engine API.
+type internalRankClient interface {
+	Close() error
+	setGoogleClientInfo(...string)
+	Connection() *grpc.ClientConn
+	Rank(context.Context, *discoveryenginepb.RankRequest, ...gax.CallOption) (*discoveryenginepb.RankResponse, error)
+	GetOperation(context.Context, *longrunningpb.GetOperationRequest, ...gax.CallOption) (*longrunningpb.Operation, error)
+	ListOperations(context.Context, *longrunningpb.ListOperationsRequest, ...gax.CallOption) *OperationIterator
+}
+
+// RankClient is a client for interacting with Discovery Engine API.
+// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
+//
+// Service for ranking text records.
+type RankClient struct {
+	// The internal transport-dependent client.
+	internalClient internalRankClient
+
+	// The call options for this service.
+	CallOptions *RankCallOptions
+}
+
+// Wrapper methods routed to the internal client.
+
+// Close closes the connection to the API service. The user should invoke this when
+// the client is no longer required.
+func (c *RankClient) Close() error {
+	return c.internalClient.Close()
+}
+
+// setGoogleClientInfo sets the name and version of the application in
+// the `x-goog-api-client` header passed on each request. Intended for
+// use by Google-written clients.
+func (c *RankClient) setGoogleClientInfo(keyval ...string) {
+	c.internalClient.setGoogleClientInfo(keyval...)
+}
+
+// Connection returns a connection to the API service.
+//
+// Deprecated: Connections are now pooled so this method does not always
+// return the same resource.
+func (c *RankClient) Connection() *grpc.ClientConn {
+	return c.internalClient.Connection()
+}
+
+// Rank ranks a list of text records based on the given input query.
+func (c *RankClient) Rank(ctx context.Context, req *discoveryenginepb.RankRequest, opts ...gax.CallOption) (*discoveryenginepb.RankResponse, error) {
+	return c.internalClient.Rank(ctx, req, opts...)
+}
+
+// GetOperation is a utility method from google.longrunning.Operations.
+func (c *RankClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
+	return c.internalClient.GetOperation(ctx, req, opts...)
+}
+
+// ListOperations is a utility method from google.longrunning.Operations.
+func (c *RankClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
+	return c.internalClient.ListOperations(ctx, req, opts...)
+}
+
+// rankGRPCClient is a client for interacting with Discovery Engine API over gRPC transport.
+//
+// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
+type rankGRPCClient struct {
+	// Connection pool of gRPC connections to the service.
+	connPool gtransport.ConnPool
+
+	// Points back to the CallOptions field of the containing RankClient
+	CallOptions **RankCallOptions
+
+	// The gRPC API client.
+	rankClient discoveryenginepb.RankServiceClient
+
+	operationsClient longrunningpb.OperationsClient
+
+	// The x-goog-* metadata to be sent with each request.
+	xGoogHeaders []string
+}
+
+// NewRankClient creates a new rank service client based on gRPC.
+// The returned client must be Closed when it is done being used to clean up its underlying connections.
+//
+// Service for ranking text records.
+func NewRankClient(ctx context.Context, opts ...option.ClientOption) (*RankClient, error) {
+	clientOpts := defaultRankGRPCClientOptions()
+	if newRankClientHook != nil {
+		hookOpts, err := newRankClientHook(ctx, clientHookParams{})
+		if err != nil {
+			return nil, err
+		}
+		clientOpts = append(clientOpts, hookOpts...)
+	}
+
+	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
+	if err != nil {
+		return nil, err
+	}
+	client := RankClient{CallOptions: defaultRankCallOptions()}
+
+	c := &rankGRPCClient{
+		connPool:         connPool,
+		rankClient:       discoveryenginepb.NewRankServiceClient(connPool),
+		CallOptions:      &client.CallOptions,
+		operationsClient: longrunningpb.NewOperationsClient(connPool),
+	}
+	c.setGoogleClientInfo()
+
+	client.internalClient = c
+
+	return &client, nil
+}
+
+// Connection returns a connection to the API service.
+//
+// Deprecated: Connections are now pooled so this method does not always
+// return the same resource.
+func (c *rankGRPCClient) Connection() *grpc.ClientConn {
+	return c.connPool.Conn()
+}
+
+// setGoogleClientInfo sets the name and version of the application in
+// the `x-goog-api-client` header passed on each request. Intended for
+// use by Google-written clients.
+func (c *rankGRPCClient) setGoogleClientInfo(keyval ...string) {
+	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
+	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
+	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
+}
+
+// Close closes the connection to the API service. The user should invoke this when
+// the client is no longer required.
+func (c *rankGRPCClient) Close() error {
+	return c.connPool.Close()
+}
+
+// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
+type rankRESTClient struct {
+	// The http endpoint to connect to.
+	endpoint string
+
+	// The http client.
+	httpClient *http.Client
+
+	// The x-goog-* headers to be sent with each request.
+	xGoogHeaders []string
+
+	// Points back to the CallOptions field of the containing RankClient
+	CallOptions **RankCallOptions
+}
+
+// NewRankRESTClient creates a new rank service rest client.
+//
+// Service for ranking text records.
+func NewRankRESTClient(ctx context.Context, opts ...option.ClientOption) (*RankClient, error) {
+	clientOpts := append(defaultRankRESTClientOptions(), opts...)
+	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
+	if err != nil {
+		return nil, err
+	}
+
+	callOpts := defaultRankRESTCallOptions()
+	c := &rankRESTClient{
+		endpoint:    endpoint,
+		httpClient:  httpClient,
+		CallOptions: &callOpts,
+	}
+	c.setGoogleClientInfo()
+
+	return &RankClient{internalClient: c, CallOptions: callOpts}, nil
+}
+
+func defaultRankRESTClientOptions() []option.ClientOption {
+	return []option.ClientOption{
+		internaloption.WithDefaultEndpoint("https://discoveryengine.googleapis.com"),
+		internaloption.WithDefaultEndpointTemplate("https://discoveryengine.UNIVERSE_DOMAIN"),
+		internaloption.WithDefaultMTLSEndpoint("https://discoveryengine.mtls.googleapis.com"),
+		internaloption.WithDefaultUniverseDomain("googleapis.com"),
+		internaloption.WithDefaultAudience("https://discoveryengine.googleapis.com/"),
+		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
+	}
+}
+
+// setGoogleClientInfo sets the name and version of the application in
+// the `x-goog-api-client` header passed on each request. Intended for
+// use by Google-written clients.
+func (c *rankRESTClient) setGoogleClientInfo(keyval ...string) {
+	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
+	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "rest", "UNKNOWN")
+	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
+}
+
+// Close closes the connection to the API service. The user should invoke this when
+// the client is no longer required.
+func (c *rankRESTClient) Close() error {
+	// Replace httpClient with nil to force cleanup.
+	c.httpClient = nil
+	return nil
+}
+
+// Connection returns a connection to the API service.
+//
+// Deprecated: This method always returns nil.
+func (c *rankRESTClient) Connection() *grpc.ClientConn {
+	return nil
+}
+func (c *rankGRPCClient) Rank(ctx context.Context, req *discoveryenginepb.RankRequest, opts ...gax.CallOption) (*discoveryenginepb.RankResponse, error) {
+	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "ranking_config", url.QueryEscape(req.GetRankingConfig()))}
+
+	hds = append(c.xGoogHeaders, hds...)
+	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
+	opts = append((*c.CallOptions).Rank[0:len((*c.CallOptions).Rank):len((*c.CallOptions).Rank)], opts...)
+	var resp *discoveryenginepb.RankResponse
+	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+		var err error
+		resp, err = c.rankClient.Rank(ctx, req, settings.GRPC...)
+		return err
+	}, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
+
+func (c *rankGRPCClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
+	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}
+
+	hds = append(c.xGoogHeaders, hds...)
+	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
+	opts = append((*c.CallOptions).GetOperation[0:len((*c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
+	var resp *longrunningpb.Operation
+	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+		var err error
+		resp, err = c.operationsClient.GetOperation(ctx, req, settings.GRPC...)
+		return err
+	}, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return resp, nil
+}
+
+func (c *rankGRPCClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
+	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}
+
+	hds = append(c.xGoogHeaders, hds...)
+	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
+	opts = append((*c.CallOptions).ListOperations[0:len((*c.CallOptions).ListOperations):len((*c.CallOptions).ListOperations)], opts...)
+	it := &OperationIterator{}
+	req = proto.Clone(req).(*longrunningpb.ListOperationsRequest)
+	it.InternalFetch = func(pageSize int, pageToken string) ([]*longrunningpb.Operation, string, error) {
+		resp := &longrunningpb.ListOperationsResponse{}
+		if pageToken != "" {
+			req.PageToken = pageToken
+		}
+		if pageSize > math.MaxInt32 {
+			req.PageSize = math.MaxInt32
+		} else if pageSize != 0 {
+			req.PageSize = int32(pageSize)
+		}
+		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+			var err error
+			resp, err = c.operationsClient.ListOperations(ctx, req, settings.GRPC...)
+			return err
+		}, opts...)
+		if err != nil {
+			return nil, "", err
+		}
+
+		it.Response = resp
+		return resp.GetOperations(), resp.GetNextPageToken(), nil
+	}
+	fetch := func(pageSize int, pageToken string) (string, error) {
+		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
+		if err != nil {
+			return "", err
+		}
+		it.items = append(it.items, items...)
+		return nextPageToken, nil
+	}
+
+	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
+	it.pageInfo.MaxSize = int(req.GetPageSize())
+	it.pageInfo.Token = req.GetPageToken()
+
+	return it
+}
+
+// Rank ranks a list of text records based on the given input query.
+func (c *rankRESTClient) Rank(ctx context.Context, req *discoveryenginepb.RankRequest, opts ...gax.CallOption) (*discoveryenginepb.RankResponse, error) {
+	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
+	jsonReq, err := m.Marshal(req)
+	if err != nil {
+		return nil, err
+	}
+
+	baseUrl, err := url.Parse(c.endpoint)
+	if err != nil {
+		return nil, err
+	}
+	baseUrl.Path += fmt.Sprintf("/v1alpha/%v:rank", req.GetRankingConfig())
+
+	params := url.Values{}
+	params.Add("$alt", "json;enum-encoding=int")
+
+	baseUrl.RawQuery = params.Encode()
+
+	// Build HTTP headers from client and context metadata.
+	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "ranking_config", url.QueryEscape(req.GetRankingConfig()))}
+
+	hds = append(c.xGoogHeaders, hds...)
+	hds = append(hds, "Content-Type", "application/json")
+	headers := gax.BuildHeaders(ctx, hds...)
+	opts = append((*c.CallOptions).Rank[0:len((*c.CallOptions).Rank):len((*c.CallOptions).Rank)], opts...)
+	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
+	resp := &discoveryenginepb.RankResponse{}
+	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+		if settings.Path != "" {
+			baseUrl.Path = settings.Path
+		}
+		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
+		if err != nil {
+			return err
+		}
+		httpReq = httpReq.WithContext(ctx)
+		httpReq.Header = headers
+
+		httpRsp, err := c.httpClient.Do(httpReq)
+		if err != nil {
+			return err
+		}
+		defer httpRsp.Body.Close()
+
+		if err = googleapi.CheckResponse(httpRsp); err != nil {
+			return err
+		}
+
+		buf, err := io.ReadAll(httpRsp.Body)
+		if err != nil {
+			return err
+		}
+
+		if err := unm.Unmarshal(buf, resp); err != nil {
+			return err
+		}
+
+		return nil
+	}, opts...)
+	if e != nil {
+		return nil, e
+	}
+	return resp, nil
+}
+
+// GetOperation is a utility method from google.longrunning.Operations.
+func (c *rankRESTClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
+	baseUrl, err := url.Parse(c.endpoint)
+	if err != nil {
+		return nil, err
+	}
+	baseUrl.Path += fmt.Sprintf("/v1alpha/%v", req.GetName())
+
+	params := url.Values{}
+	params.Add("$alt", "json;enum-encoding=int")
+
+	baseUrl.RawQuery = params.Encode()
+
+	// Build HTTP headers from client and context metadata.
+	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}
+
+	hds = append(c.xGoogHeaders, hds...)
+	hds = append(hds, "Content-Type", "application/json")
+	headers := gax.BuildHeaders(ctx, hds...)
+	opts = append((*c.CallOptions).GetOperation[0:len((*c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
+	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
+	resp := &longrunningpb.Operation{}
+	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+		if settings.Path != "" {
+			baseUrl.Path = settings.Path
+		}
+		httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
+		if err != nil {
+			return err
+		}
+		httpReq = httpReq.WithContext(ctx)
+		httpReq.Header = headers
+
+		httpRsp, err := c.httpClient.Do(httpReq)
+		if err != nil {
+			return err
+		}
+		defer httpRsp.Body.Close()
+
+		if err = googleapi.CheckResponse(httpRsp); err != nil {
+			return err
+		}
+
+		buf, err := io.ReadAll(httpRsp.Body)
+		if err != nil {
+			return err
+		}
+
+		if err := unm.Unmarshal(buf, resp); err != nil {
+			return err
+		}
+
+		return nil
+	}, opts...)
+	if e != nil {
+		return nil, e
+	}
+	return resp, nil
+}
+
+// ListOperations is a utility method from google.longrunning.Operations.
+func (c *rankRESTClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
+	it := &OperationIterator{}
+	req = proto.Clone(req).(*longrunningpb.ListOperationsRequest)
+	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
+	it.InternalFetch = func(pageSize int, pageToken string) ([]*longrunningpb.Operation, string, error) {
+		resp := &longrunningpb.ListOperationsResponse{}
+		if pageToken != "" {
+			req.PageToken = pageToken
+		}
+		if pageSize > math.MaxInt32 {
+			req.PageSize = math.MaxInt32
+		} else if pageSize != 0 {
+			req.PageSize = int32(pageSize)
+		}
+		baseUrl, err := url.Parse(c.endpoint)
+		if err != nil {
+			return nil, "", err
+		}
+		baseUrl.Path += fmt.Sprintf("/v1alpha/%v/operations", req.GetName())
+
+		params := url.Values{}
+		params.Add("$alt", "json;enum-encoding=int")
+		if req.GetFilter() != "" {
+			params.Add("filter", fmt.Sprintf("%v", req.GetFilter()))
+		}
+		if req.GetPageSize() != 0 {
+			params.Add("pageSize", fmt.Sprintf("%v", req.GetPageSize()))
+		}
+		if req.GetPageToken() != "" {
+			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
+		}
+
+		baseUrl.RawQuery = params.Encode()
+
+		// Build HTTP headers from client and context metadata.
+		hds := append(c.xGoogHeaders, "Content-Type", "application/json")
+		headers := gax.BuildHeaders(ctx, hds...)
+		e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
+			if settings.Path != "" {
+				baseUrl.Path = settings.Path
+			}
+			httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
+			if err != nil {
+				return err
+			}
+			httpReq.Header = headers
+
+			httpRsp, err := c.httpClient.Do(httpReq)
+			if err != nil {
+				return err
+			}
+			defer httpRsp.Body.Close()
+
+			if err = googleapi.CheckResponse(httpRsp); err != nil {
+				return err
+			}
+
+			buf, err := io.ReadAll(httpRsp.Body)
+			if err != nil {
+				return err
+			}
+
+			if err := unm.Unmarshal(buf, resp); err != nil {
+				return err
+			}
+
+			return nil
+		}, opts...)
+		if e != nil {
+			return nil, "", e
+		}
+		it.Response = resp
+		return resp.GetOperations(), resp.GetNextPageToken(), nil
+	}
+
+	fetch := func(pageSize int, pageToken string) (string, error) {
+		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
+		if err != nil {
+			return "", err
+		}
+		it.items = append(it.items, items...)
+		return nextPageToken, nil
+	}
+
+	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
+	it.pageInfo.MaxSize = int(req.GetPageSize())
+	it.pageInfo.Token = req.GetPageToken()
+
+	return it
+}
diff --git a/discoveryengine/apiv1alpha/rank_client_example_test.go b/discoveryengine/apiv1alpha/rank_client_example_test.go
new file mode 100644
index 000000000000..657c2d28f7f4
--- /dev/null
+++ b/discoveryengine/apiv1alpha/rank_client_example_test.go
@@ -0,0 +1,147 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
+
+package discoveryengine_test
+
+import (
+	"context"
+
+	discoveryengine "cloud.google.com/go/discoveryengine/apiv1alpha"
+	discoveryenginepb "cloud.google.com/go/discoveryengine/apiv1alpha/discoveryenginepb"
+	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
+	"google.golang.org/api/iterator"
+)
+
+func ExampleNewRankClient() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewRankClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	// TODO: Use client.
+	_ = c
+}
+
+func ExampleNewRankRESTClient() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewRankRESTClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	// TODO: Use client.
+	_ = c
+}
+
+func ExampleRankClient_Rank() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewRankClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &discoveryenginepb.RankRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/cloud.google.com/go/discoveryengine/apiv1alpha/discoveryenginepb#RankRequest.
+	}
+	resp, err := c.Rank(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	// TODO: Use resp.
+	_ = resp
+}
+
+func ExampleRankClient_GetOperation() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewRankClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &longrunningpb.GetOperationRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/cloud.google.com/go/longrunning/autogen/longrunningpb#GetOperationRequest.
+	}
+	resp, err := c.GetOperation(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	// TODO: Use resp.
+	_ = resp
+}
+
+func ExampleRankClient_ListOperations() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewRankClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &longrunningpb.ListOperationsRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/cloud.google.com/go/longrunning/autogen/longrunningpb#ListOperationsRequest.
+	}
+	it := c.ListOperations(ctx, req)
+	for {
+		resp, err := it.Next()
+		if err == iterator.Done {
+			break
+		}
+		if err != nil {
+			// TODO: Handle error.
+		}
+		// TODO: Use resp.
+		_ = resp
+
+		// If you need to access the underlying RPC response,
+		// you can do so by casting the `Response` as below.
+		// Otherwise, remove this line. Only populated after
+		// first call to Next(). Not safe for concurrent access.
+		_ = it.Response.(*longrunningpb.ListOperationsResponse)
+	}
+}
diff --git a/discoveryengine/apiv1alpha/serving_config_client.go b/discoveryengine/apiv1alpha/serving_config_client.go
index 83552f3b6609..2c715ece4c9b 100755
--- a/discoveryengine/apiv1alpha/serving_config_client.go
+++ b/discoveryengine/apiv1alpha/serving_config_client.go
@@ -143,7 +143,8 @@ type internalServingConfigClient interface {
 // ServingConfigClient is a client for interacting with Discovery Engine API.
 // Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
 //
-// Service for operations related to ServingConfig.
+// Service for operations related to
+// ServingConfig.
 type ServingConfigClient struct {
 	// The internal transport-dependent client.
 	internalClient internalServingConfigClient
@@ -226,7 +227,8 @@ type servingConfigGRPCClient struct {
 // NewServingConfigClient creates a new serving config service client based on gRPC.
 // The returned client must be Closed when it is done being used to clean up its underlying connections.
 //
-// Service for operations related to ServingConfig.
+// Service for operations related to
+// ServingConfig.
 func NewServingConfigClient(ctx context.Context, opts ...option.ClientOption) (*ServingConfigClient, error) {
 	clientOpts := defaultServingConfigGRPCClientOptions()
 	if newServingConfigClientHook != nil {
@@ -296,7 +298,8 @@ type servingConfigRESTClient struct {
 
 // NewServingConfigRESTClient creates a new serving config service rest client.
 //
-// Service for operations related to ServingConfig.
+// Service for operations related to
+// ServingConfig.
 func NewServingConfigRESTClient(ctx context.Context, opts ...option.ClientOption) (*ServingConfigClient, error) {
 	clientOpts := append(defaultServingConfigRESTClientOptions(), opts...)
 	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
diff --git a/internal/generated/snippets/discoveryengine/apiv1alpha/DocumentClient/GetProcessedDocument/main.go b/internal/generated/snippets/discoveryengine/apiv1alpha/DocumentClient/GetProcessedDocument/main.go
new file mode 100644
index 000000000000..e2d5626082fb
--- /dev/null
+++ b/internal/generated/snippets/discoveryengine/apiv1alpha/DocumentClient/GetProcessedDocument/main.go
@@ -0,0 +1,53 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
+
+// [START discoveryengine_v1alpha_generated_DocumentService_GetProcessedDocument_sync]
+
+package main
+
+import (
+	"context"
+
+	discoveryengine "cloud.google.com/go/discoveryengine/apiv1alpha"
+	discoveryenginepb "cloud.google.com/go/discoveryengine/apiv1alpha/discoveryenginepb"
+)
+
+func main() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewDocumentClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &discoveryenginepb.GetProcessedDocumentRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/cloud.google.com/go/discoveryengine/apiv1alpha/discoveryenginepb#GetProcessedDocumentRequest.
+	}
+	resp, err := c.GetProcessedDocument(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	// TODO: Use resp.
+	_ = resp
+}
+
+// [END discoveryengine_v1alpha_generated_DocumentService_GetProcessedDocument_sync]
diff --git a/internal/generated/snippets/discoveryengine/apiv1alpha/RankClient/GetOperation/main.go b/internal/generated/snippets/discoveryengine/apiv1alpha/RankClient/GetOperation/main.go
new file mode 100644
index 000000000000..6e6585d6ddfd
--- /dev/null
+++ b/internal/generated/snippets/discoveryengine/apiv1alpha/RankClient/GetOperation/main.go
@@ -0,0 +1,53 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
+
+// [START discoveryengine_v1alpha_generated_RankService_GetOperation_sync]
+
+package main
+
+import (
+	"context"
+
+	discoveryengine "cloud.google.com/go/discoveryengine/apiv1alpha"
+	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
+)
+
+func main() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewRankClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &longrunningpb.GetOperationRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/cloud.google.com/go/longrunning/autogen/longrunningpb#GetOperationRequest.
+	}
+	resp, err := c.GetOperation(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	// TODO: Use resp.
+	_ = resp
+}
+
+// [END discoveryengine_v1alpha_generated_RankService_GetOperation_sync]
diff --git a/internal/generated/snippets/discoveryengine/apiv1alpha/RankClient/ListOperations/main.go b/internal/generated/snippets/discoveryengine/apiv1alpha/RankClient/ListOperations/main.go
new file mode 100644
index 000000000000..fa8821578be8
--- /dev/null
+++ b/internal/generated/snippets/discoveryengine/apiv1alpha/RankClient/ListOperations/main.go
@@ -0,0 +1,66 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
+
+// [START discoveryengine_v1alpha_generated_RankService_ListOperations_sync]
+
+package main
+
+import (
+	"context"
+
+	discoveryengine "cloud.google.com/go/discoveryengine/apiv1alpha"
+	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
+	"google.golang.org/api/iterator"
+)
+
+func main() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewRankClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &longrunningpb.ListOperationsRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/cloud.google.com/go/longrunning/autogen/longrunningpb#ListOperationsRequest.
+	}
+	it := c.ListOperations(ctx, req)
+	for {
+		resp, err := it.Next()
+		if err == iterator.Done {
+			break
+		}
+		if err != nil {
+			// TODO: Handle error.
+		}
+		// TODO: Use resp.
+		_ = resp
+
+		// If you need to access the underlying RPC response,
+		// you can do so by casting the `Response` as below.
+		// Otherwise, remove this line. Only populated after
+		// first call to Next(). Not safe for concurrent access.
+		_ = it.Response.(*longrunningpb.ListOperationsResponse)
+	}
+}
+
+// [END discoveryengine_v1alpha_generated_RankService_ListOperations_sync]
diff --git a/internal/generated/snippets/discoveryengine/apiv1alpha/RankClient/Rank/main.go b/internal/generated/snippets/discoveryengine/apiv1alpha/RankClient/Rank/main.go
new file mode 100644
index 000000000000..c6e74be30d1c
--- /dev/null
+++ b/internal/generated/snippets/discoveryengine/apiv1alpha/RankClient/Rank/main.go
@@ -0,0 +1,53 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
+
+// [START discoveryengine_v1alpha_generated_RankService_Rank_sync]
+
+package main
+
+import (
+	"context"
+
+	discoveryengine "cloud.google.com/go/discoveryengine/apiv1alpha"
+	discoveryenginepb "cloud.google.com/go/discoveryengine/apiv1alpha/discoveryenginepb"
+)
+
+func main() {
+	ctx := context.Background()
+	// This snippet has been automatically generated and should be regarded as a code template only.
+	// It will require modifications to work:
+	// - It may require correct/in-range values for request initialization.
+	// - It may require specifying regional endpoints when creating the service client as shown in:
+	//   https://pkg.go.dev/cloud.google.com/go#hdr-Client_Options
+	c, err := discoveryengine.NewRankClient(ctx)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	defer c.Close()
+
+	req := &discoveryenginepb.RankRequest{
+		// TODO: Fill request struct fields.
+		// See https://pkg.go.dev/cloud.google.com/go/discoveryengine/apiv1alpha/discoveryenginepb#RankRequest.
+	}
+	resp, err := c.Rank(ctx, req)
+	if err != nil {
+		// TODO: Handle error.
+	}
+	// TODO: Use resp.
+	_ = resp
+}
+
+// [END discoveryengine_v1alpha_generated_RankService_Rank_sync]
diff --git a/internal/generated/snippets/discoveryengine/apiv1alpha/snippet_metadata.google.cloud.discoveryengine.v1alpha.json b/internal/generated/snippets/discoveryengine/apiv1alpha/snippet_metadata.google.cloud.discoveryengine.v1alpha.json
index 625e98bd545a..d85ff7e69685 100644
--- a/internal/generated/snippets/discoveryengine/apiv1alpha/snippet_metadata.google.cloud.discoveryengine.v1alpha.json
+++ b/internal/generated/snippets/discoveryengine/apiv1alpha/snippet_metadata.google.cloud.discoveryengine.v1alpha.json
@@ -1573,6 +1573,52 @@
         }
       ]
     },
+    {
+      "regionTag": "discoveryengine_v1alpha_generated_DocumentService_GetProcessedDocument_sync",
+      "title": "discoveryengine GetProcessedDocument Sample",
+      "description": "GetProcessedDocument gets the parsed layout information for a\n[Document][google.cloud.discoveryengine.v1alpha.Document].",
+      "file": "DocumentClient/GetProcessedDocument/main.go",
+      "language": "GO",
+      "clientMethod": {
+        "shortName": "GetProcessedDocument",
+        "fullName": "google.cloud.discoveryengine.v1alpha.DocumentClient.GetProcessedDocument",
+        "parameters": [
+          {
+            "type": "context.Context",
+            "name": "ctx"
+          },
+          {
+            "type": "discoveryenginepb.GetProcessedDocumentRequest",
+            "name": "req"
+          },
+          {
+            "type": "...gax.CallOption",
+            "name": "opts"
+          }
+        ],
+        "resultType": "*discoveryenginepb.ProcessedDocument",
+        "client": {
+          "shortName": "DocumentClient",
+          "fullName": "google.cloud.discoveryengine.v1alpha.DocumentClient"
+        },
+        "method": {
+          "shortName": "GetProcessedDocument",
+          "fullName": "google.cloud.discoveryengine.v1alpha.DocumentService.GetProcessedDocument",
+          "service": {
+            "shortName": "DocumentService",
+            "fullName": "google.cloud.discoveryengine.v1alpha.DocumentService"
+          }
+        }
+      },
+      "origin": "API_DEFINITION",
+      "segments": [
+        {
+          "start": 18,
+          "end": 53,
+          "type": "FULL"
+        }
+      ]
+    },
     {
       "regionTag": "discoveryengine_v1alpha_generated_DocumentService_ImportDocuments_sync",
       "title": "discoveryengine ImportDocuments Sample",
@@ -2401,6 +2447,144 @@
         }
       ]
     },
+    {
+      "regionTag": "discoveryengine_v1alpha_generated_RankService_GetOperation_sync",
+      "title": "discoveryengine GetOperation Sample",
+      "description": "GetOperation is a utility method from google.longrunning.Operations.",
+      "file": "RankClient/GetOperation/main.go",
+      "language": "GO",
+      "clientMethod": {
+        "shortName": "GetOperation",
+        "fullName": "google.cloud.discoveryengine.v1alpha.RankClient.GetOperation",
+        "parameters": [
+          {
+            "type": "context.Context",
+            "name": "ctx"
+          },
+          {
+            "type": "longrunningpb.GetOperationRequest",
+            "name": "req"
+          },
+          {
+            "type": "...gax.CallOption",
+            "name": "opts"
+          }
+        ],
+        "resultType": "*longrunningpb.Operation",
+        "client": {
+          "shortName": "RankClient",
+          "fullName": "google.cloud.discoveryengine.v1alpha.RankClient"
+        },
+        "method": {
+          "shortName": "GetOperation",
+          "fullName": "google.longrunning.Operations.GetOperation",
+          "service": {
+            "shortName": "Operations",
+            "fullName": "google.longrunning.Operations"
+          }
+        }
+      },
+      "origin": "API_DEFINITION",
+      "segments": [
+        {
+          "start": 18,
+          "end": 53,
+          "type": "FULL"
+        }
+      ]
+    },
+    {
+      "regionTag": "discoveryengine_v1alpha_generated_RankService_ListOperations_sync",
+      "title": "discoveryengine ListOperations Sample",
+      "description": "ListOperations is a utility method from google.longrunning.Operations.",
+      "file": "RankClient/ListOperations/main.go",
+      "language": "GO",
+      "clientMethod": {
+        "shortName": "ListOperations",
+        "fullName": "google.cloud.discoveryengine.v1alpha.RankClient.ListOperations",
+        "parameters": [
+          {
+            "type": "context.Context",
+            "name": "ctx"
+          },
+          {
+            "type": "longrunningpb.ListOperationsRequest",
+            "name": "req"
+          },
+          {
+            "type": "...gax.CallOption",
+            "name": "opts"
+          }
+        ],
+        "resultType": "OperationIterator",
+        "client": {
+          "shortName": "RankClient",
+          "fullName": "google.cloud.discoveryengine.v1alpha.RankClient"
+        },
+        "method": {
+          "shortName": "ListOperations",
+          "fullName": "google.longrunning.Operations.ListOperations",
+          "service": {
+            "shortName": "Operations",
+            "fullName": "google.longrunning.Operations"
+          }
+        }
+      },
+      "origin": "API_DEFINITION",
+      "segments": [
+        {
+          "start": 18,
+          "end": 66,
+          "type": "FULL"
+        }
+      ]
+    },
+    {
+      "regionTag": "discoveryengine_v1alpha_generated_RankService_Rank_sync",
+      "title": "discoveryengine Rank Sample",
+      "description": "Rank ranks a list of text records based on the given input query.",
+      "file": "RankClient/Rank/main.go",
+      "language": "GO",
+      "clientMethod": {
+        "shortName": "Rank",
+        "fullName": "google.cloud.discoveryengine.v1alpha.RankClient.Rank",
+        "parameters": [
+          {
+            "type": "context.Context",
+            "name": "ctx"
+          },
+          {
+            "type": "discoveryenginepb.RankRequest",
+            "name": "req"
+          },
+          {
+            "type": "...gax.CallOption",
+            "name": "opts"
+          }
+        ],
+        "resultType": "*discoveryenginepb.RankResponse",
+        "client": {
+          "shortName": "RankClient",
+          "fullName": "google.cloud.discoveryengine.v1alpha.RankClient"
+        },
+        "method": {
+          "shortName": "Rank",
+          "fullName": "google.cloud.discoveryengine.v1alpha.RankService.Rank",
+          "service": {
+            "shortName": "RankService",
+            "fullName": "google.cloud.discoveryengine.v1alpha.RankService"
+          }
+        }
+      },
+      "origin": "API_DEFINITION",
+      "segments": [
+        {
+          "start": 18,
+          "end": 53,
+          "type": "FULL"
+        }
+      ]
+    },
     {
       "regionTag": "discoveryengine_v1alpha_generated_RecommendationService_GetOperation_sync",
       "title": "discoveryengine GetOperation Sample",