diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 4245b1d855..6c3c94a332 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -24525,6 +24525,16 @@
                     "description": "Marks this ingest pipeline as deprecated.\nWhen a deprecated ingest pipeline is referenced as the default or final pipeline when creating or updating a non-deprecated index template, Elasticsearch will emit a deprecation warning.",
                     "default": false,
                     "type": "boolean"
+                  },
+                  "field_access_pattern": {
+                    "description": "Controls how processors in this pipeline should read and write data on a document's source.",
+                    "default": "classic",
+                    "x-state": "Generally available; Added in 9.2.0",
+                    "allOf": [
+                      {
+                        "$ref": "#/components/schemas/ingest._types.FieldAccessPattern"
+                      }
+                    ]
                   }
                 }
               },
@@ -103347,6 +103357,16 @@
                 "$ref": "#/components/schemas/_types.EpochTimeUnitMillis"
               }
             ]
+          },
+          "field_access_pattern": {
+            "description": "Controls how processors in this pipeline should read and write data on a document's source.",
+            "default": "classic",
+            "x-state": "Generally available; Added in 9.2.0",
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/ingest._types.FieldAccessPattern"
+              }
+            ]
           }
         }
       },
@@ -106030,6 +106050,13 @@
           "version"
         ]
       },
+      "ingest._types.FieldAccessPattern": {
+        "type": "string",
+        "enum": [
+          "classic",
+          "flexible"
+        ]
+      },
       "ingest._types.Document": {
         "type": "object",
         "properties": {
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index aa7653efe9..14e8266778 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -15016,6 +15016,16 @@
                     "description": "Marks this ingest pipeline as deprecated.\nWhen a deprecated ingest pipeline is referenced as the default or final pipeline when creating or updating a non-deprecated index template, Elasticsearch will emit a deprecation warning.",
                     "default": false,
                     "type": "boolean"
+                  },
+                  "field_access_pattern": {
+                    "description": "Controls how processors in this pipeline should read and write data on a document's source.",
+                    "default": "classic",
+                    "x-state": "Generally available",
+                    "allOf": [
+                      {
+                        "$ref": "#/components/schemas/ingest._types.FieldAccessPattern"
+                      }
+                    ]
                   }
                 }
               },
@@ -67400,6 +67410,16 @@
                 "$ref": "#/components/schemas/_types.EpochTimeUnitMillis"
               }
             ]
+          },
+          "field_access_pattern": {
+            "description": "Controls how processors in this pipeline should read and write data on a document's source.",
+            "default": "classic",
+            "x-state": "Generally available",
+            "allOf": [
+              {
+                "$ref": "#/components/schemas/ingest._types.FieldAccessPattern"
+              }
+            ]
           }
         }
       },
@@ -70083,6 +70103,13 @@
           "version"
         ]
       },
+      "ingest._types.FieldAccessPattern": {
+        "type": "string",
+        "enum": [
+          "classic",
+          "flexible"
+        ]
+      },
       "ingest._types.Document": {
         "type": "object",
         "properties": {
diff --git a/output/schema/schema.json b/output/schema/schema.json
index a02a7ba70c..5b00b6ef52 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -181547,6 +181547,22 @@
       ],
       "specLocation": "ingest/_types/Processors.ts#L893-L899"
     },
+    {
+      "kind": "enum",
+      "members": [
+        {
+          "name": "classic"
+        },
+        {
+          "name": "flexible"
+        }
+      ],
+      "name": {
+        "name": "FieldAccessPattern",
+        "namespace": "ingest._types"
+      },
+      "specLocation": "ingest/_types/Pipeline.ts#L115-L118"
+    },
     {
       "kind": "enum",
       "members": [
@@ -183343,9 +183359,28 @@
               "namespace": "_types"
             }
           }
+        },
+        {
+          "availability": {
+            "serverless": {},
+            "stack": {
+              "since": "9.2.0"
+            }
+          },
+          "description": "Controls how processors in this pipeline should read and write data on a document's source.",
+          "name": "field_access_pattern",
+          "required": false,
+          "serverDefault": "classic",
+          "type": {
+            "kind": "instance_of",
+            "type": {
+              "name": "FieldAccessPattern",
+              "namespace": "ingest._types"
+            }
+          }
         }
       ],
-      "specLocation": "ingest/_types/Pipeline.ts#L24-L76"
+      "specLocation": "ingest/_types/Pipeline.ts#L24-L83"
     },
     {
       "kind": "interface",
@@ -183394,7 +183429,7 @@
           }
         }
       ],
-      "specLocation": "ingest/_types/Pipeline.ts#L92-L106"
+      "specLocation": "ingest/_types/Pipeline.ts#L99-L113"
     },
     {
       "kind": "interface",
@@ -186835,6 +186870,25 @@
                 "namespace": "_builtins"
               }
             }
+          },
+          {
+            "availability": {
+              "serverless": {},
+              "stack": {
+                "since": "9.2.0"
+              }
+            },
+            "description": "Controls how processors in this pipeline should read and write data on a document's source.",
+            "name": "field_access_pattern",
+            "required": false,
+            "serverDefault": "classic",
+            "type": {
+              "kind": "instance_of",
+              "type": {
+                "name": "FieldAccessPattern",
+                "namespace": "ingest._types"
+              }
+            }
           }
         ]
       },
@@ -186960,7 +187014,7 @@
           }
         }
       ],
-      "specLocation": "ingest/put_pipeline/PutPipelineRequest.ts#L25-L90"
+      "specLocation": "ingest/put_pipeline/PutPipelineRequest.ts#L26-L98"
     },
     {
       "kind": "response",
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index 89e2736f04..e662f9c045 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -14978,6 +14978,8 @@ export interface IngestFailProcessor extends IngestProcessorBase {
   message: string
 }
 
+export type IngestFieldAccessPattern = 'classic' | 'flexible'
+
 export type IngestFingerprintDigest = 'MD5' | 'SHA-1' | 'SHA-256' | 'SHA-512' | 'MurmurHash3'
 
 export interface IngestFingerprintProcessor extends IngestProcessorBase {
@@ -15159,6 +15161,7 @@ export interface IngestPipeline {
   created_date_millis?: EpochTime<UnitMillis>
   modified_date?: DateTime
   modified_date_millis?: EpochTime<UnitMillis>
+  field_access_pattern?: IngestFieldAccessPattern
 }
 
 export interface IngestPipelineConfig {
@@ -15495,6 +15498,7 @@ export interface IngestPutPipelineRequest extends RequestBase {
     processors?: IngestProcessorContainer[]
     version?: VersionNumber
     deprecated?: boolean
+    field_access_pattern?: IngestFieldAccessPattern
   }
 }
 
diff --git a/specification/ingest/_types/Pipeline.ts b/specification/ingest/_types/Pipeline.ts
index 8b84a389c9..eb82c5069b 100644
--- a/specification/ingest/_types/Pipeline.ts
+++ b/specification/ingest/_types/Pipeline.ts
@@ -73,6 +73,13 @@ export class Pipeline {
    * @availability serverless
    */
   modified_date_millis?: EpochTime<UnitMillis>
+  /**
+   * Controls how processors in this pipeline should read and write data on a document's source.
+   * @server_default classic
+   * @availability stack since=9.2.0
+   * @availability serverless
+   */
+  field_access_pattern?: FieldAccessPattern
 }
 
 // Unused .. but let's keep it for now
@@ -104,3 +111,8 @@ export class PipelineConfig {
    */
   processors: ProcessorContainer[]
 }
+
+export enum FieldAccessPattern {
+  classic,
+  flexible
+}
diff --git a/specification/ingest/put_pipeline/PutPipelineRequest.ts b/specification/ingest/put_pipeline/PutPipelineRequest.ts
index d55448b6e5..193730df45 100644
--- a/specification/ingest/put_pipeline/PutPipelineRequest.ts
+++ b/specification/ingest/put_pipeline/PutPipelineRequest.ts
@@ -20,6 +20,7 @@
 import { RequestBase } from '@_types/Base'
 import { Id, Metadata, VersionNumber } from '@_types/common'
 import { Duration } from '@_types/Time'
+import { FieldAccessPattern } from '@ingest/_types/Pipeline'
 import { ProcessorContainer } from '@ingest/_types/Processors'
 
 /**
@@ -86,5 +87,12 @@ export interface Request extends RequestBase {
      * @server_default false
      */
     deprecated?: boolean
+    /**
+     * Controls how processors in this pipeline should read and write data on a document's source.
+     * @server_default classic
+     * @availability stack since=9.2.0
+     * @availability serverless
+     */
+    field_access_pattern?: FieldAccessPattern
   }
 }