diff --git a/google/firestore/admin/v1/index.proto b/google/firestore/admin/v1/index.proto
index 54b5e7e8776e0..2567da6509c44 100644
--- a/google/firestore/admin/v1/index.proto
+++ b/google/firestore/admin/v1/index.proto
@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -50,6 +50,21 @@ message Index {
     // against all collections that has the collection id specified by the
     // index.
     COLLECTION_GROUP = 2;
+
+    // Include all the collections's ancestor in the index. Only available for
+    // Datastore Mode databases.
+    COLLECTION_RECURSIVE = 3;
+  }
+
+  // API Scope defines the APIs (Firestore Native, or Firestore in
+  // Datastore Mode) that are supported for queries.
+  enum ApiScope {
+    // The index can only be used by the Firestore Native query API.
+    // This is the default.
+    ANY_API = 0;
+
+    // The index can only be used by the Firestore in Datastore Mode query API.
+    DATASTORE_MODE_API = 1;
   }
 
   // A field in an index.
@@ -138,14 +153,17 @@ message Index {
   // time, and that have the same collection id as this index.
   QueryScope query_scope = 2;
 
+  // The API scope supported by this index.
+  ApiScope api_scope = 5;
+
   // The fields supported by this index.
   //
-  // For composite indexes, this is always 2 or more fields.
-  // The last field entry is always for the field path `__name__`. If, on
-  // creation, `__name__` was not specified as the last field, it will be added
-  // automatically with the same direction as that of the last field defined. If
-  // the final field in a composite index is not directional, the `__name__`
-  // will be ordered ASCENDING (unless explicitly specified).
+  // For composite indexes, this requires a minimum of 2 and a maximum of 100
+  // fields. The last field entry is always for the field path `__name__`. If,
+  // on creation, `__name__` was not specified as the last field, it will be
+  // added automatically with the same direction as that of the last field
+  // defined. If the final field in a composite index is not directional, the
+  // `__name__` will be ordered ASCENDING (unless explicitly specified).
   //
   // For single field indexes, this will always be exactly one entry with a
   // field path equal to the field path of the associated field.