add changelog

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

Author: kaushalmahi12

CHANGELOG.md

@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Introduce a new pull-based ingestion plugin for file-based indexing (for local testing) ([#18591](https://github.com/opensearch-project/OpenSearch/pull/18591))
 - Add support for search pipeline in search and msearch template ([#18564](https://github.com/opensearch-project/OpenSearch/pull/18564))
 - Add BooleanQuery rewrite moving constant-scoring must clauses to filter clauses ([#18510](https://github.com/opensearch-project/OpenSearch/issues/18510))
+- Add the configurable limit on rule cardinality ([#18663](https://github.com/opensearch-project/OpenSearch/pull/18663))
 
 ### Changed
 - Update Subject interface to use CheckedRunnable ([#18570](https://github.com/opensearch-project/OpenSearch/issues/18570))