Added shrink index API and fixed Java compatibility

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

_opensearch/install/compatibility.md

@@ -16,4 +16,4 @@ nav_order: 2
 
 OpenSearch version | Compatible Java versions | Recommended operating systems
 :--- | :--- | :---
-1.x | 8, 11 | Red Hat Enterprise Linux 7, 8; CentOS 7, 8; Amazon Linux 2; Ubuntu 16.04, 18.04, 20.04
+1.x | 8, 11, 15 | Red Hat Enterprise Linux 7, 8; CentOS 7, 8; Amazon Linux 2; Ubuntu 16.04, 18.04, 20.04

_opensearch/rest-api/index-apis/shrink-index.md

@@ -0,0 +1,61 @@
+---
+layout: default
+title: Shrink index
+parent: Index APIs
+grand_parent: REST API reference
+nav_order: 50
+---
+
+# Shrink index
+
+The shrink index API operation moves all of your data in an existing index into a new index with fewer primary shards.
+
+## Example
+
+```json
+POST /my-old-index/_shrink/my-new-index
+{
+  "settings": {
+    "index.number_of_replicas": 4,
+    "index.number_of_shards": 3
+  },
+  "aliases":{
+    "new-index-alias": {}
+  }
+}
+```
+
+## Path and HTTP methods
+
+```
+POST /<index-name>/_shrink/<target-index>
+```
+
+When creating new indices with this operation, remember that OpenSearch indices have the following naming restrictions:
+
+- All letters must be lowercase.
+- Index names can't begin with underscores (`_`) or hyphens (`-`).
+- Index names can't contain spaces, commas, or the following characters:
+
+  `:`, `"`, `*`, `+`, `/`, `\`, `|`, `?`, `#`, `>`, or `<`
+
+## URL parameters
+
+The shrink index API operation requires you to specify both the source index and the target index. All other parameters are optional.
+
+Parameter | Type | description
+:--- | :--- | :---
+&lt;index-name&gt; | String | The index to shrink.
+&lt;target-index&gt; | String | The target index to shrink the source index into.
+wait_for_active_shards | String | Specifies the number of active shards that must be available before OpenSearch processes the request. Default is 1 (only the primary shard). Set to all or a positive integer. Values greater than 1 require replicas. For example, if you specify a value of 3, the index must have two replicas distributed across two additional nodes for the request to succeed.
+master_timeout | Time | How long to wait for a connection to the master node. Default is `30s`.
+timeout | Time | How long to wait for the request to return. Default is `30s`.
+
+## Request body
+
+You can use the request body to configure some index settings for the target index. All fields are optional.
+
+Field | Type | Description
+alias | Object | Sets an alias for the target index. Can have the fields `filter`, `index_routing`, `is_hidden`, `is_write_index`, `routing`, and `search_routing`. See [index aliases]({{site.url}}{{site.baseurl}}/opensearch/rest-api/alias/#request-body).
+settings | Object | Index settings you can apply to your target index. See [index settings]({{site.url}}{{site.baseurl}}/opensearch/rest-api/index-apis/create-index/#index-settings).
+max_primary_shard_size | Bytes | Sets the maximum size of a primary shard in the target index. For example, if this field is set to 100gb, and the source index's primary shards total to 300gb, then the target index has 3 primary shards of 100gb each.