add changelog entry

Signed-off-by: Kaushal Kumar <[email protected]>

Author: kaushalmahi12

CHANGELOG.md

@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add execution_hint to cardinality aggregator request (#[17419](https://github.com/opensearch-project/OpenSearch/pull/17419))
 - Fix Bug - Handle unsigned long in sorting order assertion of LongHashSet ([#17207](https://github.com/opensearch-project/OpenSearch/pull/17207))
 - [Rule Based Auto-tagging] Add in-memory attribute value store ([#17342](https://github.com/opensearch-project/OpenSearch/pull/17342))
+- [Rule Based Auto-tagging] Add in-memory rule processing service ([#17365](https://github.com/opensearch-project/OpenSearch/pull/17365))
 - Change priority for scheduling reroute during timeout([#16445](https://github.com/opensearch-project/OpenSearch/pull/16445))
 
 ### Dependencies