Added couple settings API

Signed-off-by: keithhc2 <keithhc2@users.noreply.github.com>

_opensearch/rest-api/index-apis/get-settings.md

@@ -0,0 +1,64 @@
+---
+layout: default
+title: Get settings
+parent: Index APIs
+grand_parent: REST API reference
+nav_order: 100
+---
+
+# Get settings
+Introduced 1.0
+{: .label .label-purple }
+
+The get settings API operation returns all the settings in your index.
+
+## Example
+
+```json
+GET /sample-index1/_settings
+```
+
+## Path and HTTP methods
+
+```
+GET /<target-index>/_settings
+GET /<target-index>/_settings/<setting>
+```
+
+## URL parameters
+
+All update settings parameters are optional.
+
+Parameter | Data Type | Description
+:--- | :--- | :---
+&lt;target-index&gt; | String | The index to get settings from. Can be a comma-separated list to get settings from multiple indexes, or use `_all` to return settings from all indexes within the cluster.
+&lt;setting&gt; | String | Filter to return specific settings.
+allow_no_indices | Boolean | Whether to ignore wildcards that don’t match any indexes. Default is `true`.
+expand_wildcards | String | Expands wildcard expressions to different indexes. Combine multiple values with commas. Available values are `all` (match all indexes), `open` (match open indexes), `closed` (match closed indexes), `hidden` (match hidden indexes), and `none` (do not accept wildcard expressions), which must be used with `open`, `closed`, or both. Default is `open`.
+flat_settings | Boolean | Whether to return settings in the flat form, which can improve readability, especially for heavily nested settings. For example, the flat form of “index”: { “creation_date”: “123456789” } is “index.creation_date”: “123456789”.
+include_defaults | String | Whether to include default settings, including settings used within OpenSearch's plugins, in the response. Default is false.
+ignore_unavailable | Boolean | If true, OpenSearch does not include missing or closed indexes in the response.
+local | Boolean | Whether to return information from the local node only instead of the master node. Default is false.
+master_timeout | Time | How long to wait for a connection to the master node. Default is `30s`.
+
+## Response
+
+```json
+{
+  "sample-index1": {
+    "settings": {
+      "index": {
+        "creation_date": "1622672553417",
+        "number_of_shards": "1",
+        "number_of_replicas": "1",
+        "uuid": "GMEA0_TkSaamrnJSzNLzwg",
+        "version": {
+          "created": "135217827",
+          "upgraded": "135238227"
+        },
+        "provided_name": "sample-index1"
+      }
+    }
+  }
+}
+```

_opensearch/rest-api/index-apis/put-mapping.md

@@ -1,8 +1,9 @@
 ---
 layout: default
 title: Put mapping
-parent: REST API reference
-nav_order: 30
+parent: Index APIs
+grand_parent: REST API reference
+nav_order: 200
 ---
 
 # Put mapping

_opensearch/rest-api/index-apis/update-mapping.md

@@ -1,8 +1,9 @@
 ---
 layout: default
 title: Update mapping
-parent: REST API reference
-nav_order: 35
+parent: Index APIs
+grand_parent: REST API reference
+nav_order: 220
 ---
 
 # Update mapping

_opensearch/rest-api/index-apis/update-settings.md

@@ -0,0 +1,68 @@
+---
+layout: default
+title: Update settings
+parent: Index APIs
+grand_parent: REST API reference
+nav_order: 120
+---
+
+# Update settings
+Introduced 1.0
+{: .label .label-purple }
+
+You can use the update settings API operation to update index-level settings. You can change dynamic index settings at any time, but static settings cannot be changed after index creation. For more information about static and dynamic index settings, see [Create index]({{site.url}}{{site.baseurl}}/opensearch/rest-api/index-apis/create-index/#index-settings).
+
+Aside from the static and dynamic index settings, you can also update individual plugins' settings. To get the full list of updatable settings, run `GET <target-index>/_settings?include_defaults=true`.
+
+## Example
+
+```json
+PUT /sample-index1/_settings
+{
+  "index.plugins.index_state_management.rollover_skip": true,
+  "index": {
+    "number_of_replicas": 4
+  }
+}
+```
+
+## Path and HTTP methods
+
+```
+PUT /<target-index>/_settings
+```
+
+## URL parameters
+
+All update settings parameters are optional.
+
+Parameter | Data Type | Description
+:--- | :--- | :---
+allow_no_indices | Boolean | Whether to ignore wildcards that don’t match any indexes. Default is `true`.
+expand_wildcards | String | Expands wildcard expressions to different indexes. Combine multiple values with commas. Available values are `all` (match all indexes), `open` (match open indexes), `closed` (match closed indexes), `hidden` (match hidden indexes), and `none` (do not accept wildcard expressions), which must be used with `open`, `closed`, or both. Default is `open`.
+flat_settings | Boolean | Whether to return settings in the flat form, which can improve readability, especially for heavily nested settings. For example, the flat form of “index”: { “creation_date”: “123456789” } is “index.creation_date”: “123456789”.
+ignore_unavailable | Boolean | If true, OpenSearch does not include missing or closed indexes in the response.
+preserve_existing | Boolean | Whether to preserve existing index settings. Default is false.
+master_timeout | Time | How long to wait for a connection to the master node. Default is `30s`.
+timeout | Time | How long to wait for a connection to return. Default is `30s`.
+
+## Request body
+
+The request body must all of the index settings that you want to update.
+
+```json
+{
+  "index.plugins.index_state_management.rollover_skip": true,
+  "index": {
+    "number_of_replicas": 4
+  }
+}
+```
+
+## Response
+
+```json
+{
+    "acknowledged": true
+}
+```