add CHANGELOG entry

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

Author: kaushalmahi12

CHANGELOG.md

@@ -42,6 +42,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - [Star Tree] [Search] Resolving Date histogram with metric aggregation using star-tree ([#16674](https://github.com/opensearch-project/OpenSearch/pull/16674))
 - [Star Tree] [Search] Extensible design to support different query and field types ([#17137](https://github.com/opensearch-project/OpenSearch/pull/17137))
 - Improve performace of NumericTermAggregation by avoiding unnecessary sorting([#17252](https://github.com/opensearch-project/OpenSearch/pull/17252))
+- [Rule Based Auto-tagging] Add in-memory attribute value store ([#17342](https://github.com/opensearch-project/OpenSearch/pull/17342))
 
 ### Dependencies
 - Bump `com.google.cloud:google-cloud-core-http` from 2.23.0 to 2.47.0 ([#16504](https://github.com/opensearch-project/OpenSearch/pull/16504))