DOCSP-43565: Update Indexes page to clarify Vector Search Indexes use the plural create method (#176)

* Update Indexes page to clarify that vector search indexes require the plural create method

* Apply suggestions from code review

Co-authored-by: Rea Rustagi <[email protected]>

---------

Co-authored-by: Rea Rustagi <[email protected]>
(cherry picked from commit a34cd46)

Author: cbullinger

source/fundamentals/indexes.txt

@@ -241,7 +241,7 @@ embeddings stored in MongoDB Atlas. To learn more about Atlas Vector Search, see
 You can call the following methods on a collection to manage your Atlas
 Search and Vector Search indexes:
 
-- ``createSearchIndex()``
+- ``createSearchIndex()`` *(valid for Search indexes only)*
 - ``createSearchIndexes()``
 - ``listSearchIndexes()``
 - ``updateSearchIndex()``
@@ -261,9 +261,16 @@ Create a Search Index
 +++++++++++++++++++++
 
 You can use the `createSearchIndex() <{+api+}/apidocs/mongodb-driver-kotlin-coroutine/mongodb-driver-kotlin-coroutine/com.mongodb.kotlin.client.coroutine/-mongo-collection/create-search-index.html>`__
-and `createSearchIndexes() <{+api+}/apidocs/mongodb-driver-kotlin-coroutine/mongodb-driver-kotlin-coroutine/com.mongodb.kotlin.client.coroutine/-mongo-collection/create-search-indexes.html>`__
-methods to create Atlas Search and Vector Search indexes on a
-collection.
+method to create a single Atlas Search index. You *cannot* use this method to
+create a Vector Search index.
+
+You can use the
+`createSearchIndexes() <{+api+}/apidocs/mongodb-driver-kotlin-coroutine/mongodb-driver-kotlin-coroutine/com.mongodb.kotlin.client.coroutine/-mongo-collection/create-search-indexes.html>`__
+method to create multiple Atlas Search or Vector Search
+indexes. You must create a
+`SearchIndexModel
+<{+api+}/apidocs/mongodb-driver-core/com/mongodb/client/model/SearchIndexModel.html>`__
+instance for each index, then pass a list of ``SearchIndexModel`` instances to the ``createSearchIndexes()`` method.
 
 The following code example shows how to create an Atlas Search index: