Weighted routing/backport2.4 (#5057)

* Weighted round-robin scheduling policy for shard coordination traffic… (#4241)

* Add PUT api to update shard routing weights (#4272)

* Add GET api to get shard routing weights (#4275)

* Fix weighted routing metadata deserialization error during node restart (#4691)

* Delete API for weighted round robin search routing (#4917 

* Mark apis experimental

Signed-off-by: Anshu Agarwal <anshukag@amazon.com>

Author: anshu1106

CHANGELOG.md

@@ -50,6 +50,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Changed
 - Dependency updates (httpcore, mockito, slf4j, httpasyncclient, commons-codec) ([#4308](https://github.com/opensearch-project/OpenSearch/pull/4308))
 - Use RemoteSegmentStoreDirectory instead of RemoteDirectory ([#4240](https://github.com/opensearch-project/OpenSearch/pull/4240))
+- Weighted round-robin scheduling policy for shard coordination traffic ([#4241](https://github.com/opensearch-project/OpenSearch/pull/4241))
 - Add index specific setting for remote repository ([#4253](https://github.com/opensearch-project/OpenSearch/pull/4253))
 - [Segment Replication] Update replicas to commit SegmentInfos instead of relying on SIS files from primary shards. ([#4402](https://github.com/opensearch-project/OpenSearch/pull/4402))
 - Change the version to remove deprecated code of adding node name into log pattern of log4j property file ([#4569](https://github.com/opensearch-project/OpenSearch/pull/4569))
@@ -58,6 +59,10 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Plugin ZIP publication groupId value is configurable ([#4156](https://github.com/opensearch-project/OpenSearch/pull/4156))
 - Further simplification of the ZIP publication implementation ([#4360](https://github.com/opensearch-project/OpenSearch/pull/4360))
 - [Remote Store] Change behaviour in replica recovery for remote translog enabled indices ([#4318](https://github.com/opensearch-project/OpenSearch/pull/4318))
+- PUT api for weighted shard routing ([#4272](https://github.com/opensearch-project/OpenSearch/pull/4272))
+- GET api for weighted shard routing([#4275](https://github.com/opensearch-project/OpenSearch/pull/4275/))
+- Delete api for weighted shard routing([#4400](https://github.com/opensearch-project/OpenSearch/pull/4400/))
+- Fix weighted routing metadata deserialization error on process restart ([#4691](https://github.com/opensearch-project/OpenSearch/pull/4691))
 
 ### Deprecated
 ### Removed

client/rest-high-level/src/test/java/org/opensearch/client/RestHighLevelClientTests.java

@@ -888,7 +888,10 @@ public void testApiNamingConventions() throws Exception {
             "nodes.usage",
             "nodes.reload_secure_settings",
             "search_shards",
-            "remote_store.restore", };
+            "remote_store.restore",
+            "cluster.put_weighted_routing",
+            "cluster.get_weighted_routing",
+            "cluster.delete_weighted_routing", };
         List<String> booleanReturnMethods = Arrays.asList("security.enable_user", "security.disable_user", "security.change_password");
         Set<String> deprecatedMethods = new HashSet<>();
         deprecatedMethods.add("indices.force_merge");