[DOCS] Add data streams to bulk, delete, and index API docs (#58340)

Updates existing docs for the bulk, delete and index APIs to make them
aware of data streams.

docs/reference/docs/bulk.asciidoc

@@ -24,7 +24,7 @@ POST _bulk
 
 `POST /_bulk`
 
-`POST /<index>/_bulk`
+`POST /<target>/_bulk`
 
 [[docs-bulk-api-desc]]
 ==== {api-description-title}
@@ -47,8 +47,12 @@ optional_source\n
 
 The `index` and `create` actions expect a source on the next line, 
 and have the same semantics as the `op_type` parameter in the standard index API: 
-create fails if a document with the same name already exists in the index,  
-index adds or replaces a document as necessary. 
+`create` fails if a document with the same ID already exists in the target,
+`index` adds or replaces a document as necessary. 
+
+NOTE: <<data-streams,Data streams>> support only the `create` action. To update
+or delete a document in a data stream, you must target the backing index
+containing the document. See <<update-delete-docs-in-a-data-stream>>.
 
 `update` expects that the partial doc, upsert, 
 and script and its options are specified on the next line.
@@ -67,8 +71,8 @@ the `Content-Type` header should be set to `application/x-ndjson`.
 Because this format uses literal `\n`'s as delimiters, 
 make sure that the JSON actions and sources are not pretty printed.
 
-If you specify an index in the request URI, 
-it is used for any actions that don't explicitly specify an index.
+If you provide a `<target>` in the request path, 
+it is used for any actions that don't explicitly specify an `_index` argument.
 
 A note on the format: The idea here is to make processing of this as
 fast as possible. As some of the actions are redirected to other
@@ -192,8 +196,10 @@ See <<url-access-control>>.
 [[docs-bulk-api-path-params]]
 ==== {api-path-parms-title}
 
-`<index>`::
-(Optional, string) Name of the index to perform the bulk actions against.
+`<target>`::
+(Optional, string)
+Name of the data stream, index, or index alias to perform bulk actions
+on.
 
 [[docs-bulk-api-query-params]]
 ==== {api-query-parms-title}
@@ -321,7 +327,8 @@ operation.
 =====
 `_index`::
 (string)
-The index name or alias associated with the operation.
+Name of the index associated with the operation. If the operation targeted a
+data stream, this is the backing index into which the document was written.
 
 `_id`::
 (integer)
@@ -410,7 +417,9 @@ ID of the shard associated with the failed operation.
 
 `index`::
 (string)
-The index name or alias associated with the failed operation.
+Name of the index associated with the failed operation. If the operation
+targeted a data stream, this is the backing index into which the document was
+attempted to be written.
 ======
 =====
 ====

docs/reference/docs/delete.asciidoc

@@ -17,6 +17,10 @@ Removes a JSON document from the specified index.
 You use DELETE to remove a document from an index. You must specify the
 index name and document ID.
 
+NOTE: You cannot send deletion requests directly to a data stream. To delete a
+document in a data stream, you must target the backing index containing the
+document. See <<update-delete-docs-in-a-data-stream>>.
+
 [float]
 [[optimistic-concurrency-control-delete]]
 ===== Optimistic concurrency control

docs/reference/docs/index_.asciidoc

@@ -6,27 +6,40 @@
 
 IMPORTANT: See <<removal-of-types>>.
 
-Adds a JSON document to the specified index and makes
-it searchable. If the document already exists,
-updates the document and increments its version.
+Adds a JSON document to the specified data stream or index and makes
+it searchable. If the target is an index and the document already exists,
+the request updates the document and increments its version.
+
+NOTE: You cannot send update requests for existing documents to a data stream.
+To update a document in a data stream, you must target the backing index
+containing the document. See <<update-delete-docs-in-a-data-stream>>.
 
 [[docs-index-api-request]]
 ==== {api-request-title}
 
-`PUT /<index>/_doc/<_id>`
+`PUT /<target>/_doc/<_id>`
 
-`POST /<index>/_doc/`
+`POST /<target>/_doc/`
 
-`PUT /<index>/_create/<_id>`
+`PUT /<target>/_create/<_id>`
 
-`POST /<index>/_create/<_id>`
+`POST /<target>/_create/<_id>`
 
 [[docs-index-api-path-params]]
 ==== {api-path-parms-title}
 
-`<index>`::
-(Required, string) Name of the target index. By default, the index is created
-automatically if it doesn't exist. For more information, see <<index-creation>>.
+`<target>`::
+(Required, string) Name of the data stream or index to target.
++
+If the target doesn't exist and matches the name or wildcard (`*`) pattern of a
+<<create-a-data-stream-template,composable template with a `data_stream`
+definition>>, this request creates the data stream. See
+<<set-up-a-data-stream>>.
++
+If the target doesn't exist and doesn't match a data stream template,
+this request creates the index.
++
+You can check for existing targets using the resolve index API.
 
 `<_id>`::
 (Optional, string) Unique identifier for the document. Required if you are
@@ -48,6 +61,9 @@ if it does not already exist (_put if absent_). If a document with the specified
 `_id` already exists, the indexing operation will fail. Same as using the
 `<index>/_create` endpoint. Valid values: `index`, `create`.
 If document id is specified, it defaults to `index`. Otherwise, it defaults to `create`.
++
+NOTE: If the request targets a data stream, an `op_type` of `create` is
+required. See <<add-documents-to-a-data-stream>>.
 
 include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=pipeline]
 
@@ -125,12 +141,19 @@ You can index a new JSON document with the `_doc` or `_create` resource. Using
 exist. To update an existing document, you must use the `_doc` resource.
 
 [[index-creation]]
-===== Create indices automatically
+===== Automatically create data streams and indices
+
+If request's target doesn't exist and matches a
+<<create-a-data-stream-template,composable template with a `data_stream`
+definition>>, the index operation automatically creates the data stream. See
+<<set-up-a-data-stream>>.
 
-If the specified index does not already exist, by default the index operation
-automatically creates it and applies any configured
-<<indices-templates,index templates>>. If no mapping exists, the index operation
-creates a dynamic mapping.  By default,  new fields and objects are
+If the target doesn't exist and doesn't match a data stream template,
+the operation automatically creates the index and applies any matching
+<<indices-templates,index templates>>.
+
+If no mapping exists, the index operation
+creates a dynamic mapping. By default, new fields and objects are
 automatically added to the mapping if needed. For more information about field
 mapping, see <<mapping,mapping>> and the <<indices-put-mapping,put mapping>> API.
 
@@ -142,6 +165,9 @@ automatic creation of indices that match specified patterns, or set it to
 comma-separated list of patterns you want to allow, or prefix each pattern with
 `+` or `-` to indicate whether it should be allowed or blocked.  When a list is
 specified, the default behaviour is to disallow.
++
+IMPORTANT: The `action.auto_create_index` setting only affects the automatic
+creation of indices. It does not affect the creation of data streams.
 
 [source,console]
 --------------------------------------------------

docs/reference/rest-api/common-parms.asciidoc

@@ -430,8 +430,8 @@ end::index-total[]
 tag::bulk-index[]
 `_index`::
 (Optional, string)
-The name of the target index.
-Required if not specified as a path parameter.
+Name of the data stream, index, or index alias to perform the action on. This
+parameter is required if a `<target>` is not specified in the request path.
 end::bulk-index[]
 
 tag::index-metric[]