Adds data streams, shrink, snapshot and template API (#1768)

* Adds get all data streams

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Added more APIs

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

_api-reference/index-apis/shrink-index.md

@@ -28,6 +28,7 @@ POST /my-old-index/_shrink/my-new-index
 
 ```
 POST /<index-name>/_shrink/<target-index>
+PUT /<index-name>/_shrink/<target-index>
 ```
 
 When creating new indices with this operation, remember that OpenSearch indices have the following naming restrictions:

_api-reference/snapshots/create-snapshot.md

@@ -13,6 +13,13 @@ Creates a snapshot within an existing repository.
 
 * To view a list of your repositories, see [Get snapshot repository]({{site.url}}{{site.baseurl}}/api-reference/snapshots/get-snapshot-repository).
 
+### Path and HTTP methods
+
+```json
+PUT /_snapshot/<repository>/<snapshot>
+POST /_snapshot/<repository>/<snapshot>
+```
+
 ### Path parameters
 
 Parameter | Data Type | Description

_opensearch/data-streams.md

@@ -140,6 +140,12 @@ GET _data_stream/logs-nginx/_stats
 }
 ```
 
+To see information about all data streams, use the following request:
+
+```json
+GET _data_stream
+```
+
 ### Step 3: Ingest data into the data stream
 
 To ingest data into a data stream, you can use the regular indexing APIs. Make sure every document that you index has a timestamp field. If you try to ingest a document that doesn't have a timestamp field, you get an error.

_opensearch/search-template.md

@@ -205,6 +205,15 @@ POST _render/template
 }
 ```
 
+The following render operations are supported:
+
+```json
+GET /_render/template
+POST /_render/template
+GET /_render/template/<id>
+POST /_render/template/<id>
+```
+
 ## Advanced parameter conversion with search templates
 
 You have a lot of different syntax options in Mustache to transpose the input parameters into a query.