updated changelog

Signed-off-by: Lingxi Chen <lingxich@amazon.com>

Author: Lingxi Chen

CHANGELOG.md

@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - [Rule based Auto-tagging] Add wlm `ActionFilter` ([#17791](https://github.com/opensearch-project/OpenSearch/pull/17791))
 - [Rule based auto-tagging] Add update rule API ([#17797](https://github.com/opensearch-project/OpenSearch/pull/17797))
 - [Rule based auto-tagging] Bug fix for update rule api ([#18488](https://github.com/opensearch-project/OpenSearch/pull/18488))
+- [Rule based auto-tagging] Add Rule based auto-tagging IT ([#18550](https://github.com/opensearch-project/OpenSearch/pull/18550))
 - Update API of Message in index to add the timestamp for lag calculation in ingestion polling ([#17977](https://github.com/opensearch-project/OpenSearch/pull/17977/))
 - Add Warm Disk Threshold Allocation Decider for Warm shards ([#18082](https://github.com/opensearch-project/OpenSearch/pull/18082))
 - Add composite directory factory ([#17988](https://github.com/opensearch-project/OpenSearch/pull/17988))