Updating changelog description

Signed-off-by: Ankit Jain <jainankitk@apache.org>

Author: jainankitk

CHANGELOG.md

@@ -18,7 +18,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Handle deleted documents for filter rewrite sub-aggregation optimization ([#19643](https://github.com/opensearch-project/OpenSearch/pull/19643))
 - Add bulk collect API for filter rewrite sub-aggregation optimization ([#19933](https://github.com/opensearch-project/OpenSearch/pull/19933))
 - Allow collectors take advantage of preaggregated data using collectRange API ([#20009](https://github.com/opensearch-project/OpenSearch/pull/20009))
-- Bulk collection logic for CardinalityAggregator ([#20067](https://github.com/opensearch-project/OpenSearch/pull/20067))
+- Bulk collection logic for metrics and cardinality aggregations ([#20067](https://github.com/opensearch-project/OpenSearch/pull/20067))
 - Add pointer based lag metric in pull-based ingestion ([#19635](https://github.com/opensearch-project/OpenSearch/pull/19635))
 - Introduced internal API for retrieving metadata about requested indices from transport actions  ([#18523](https://github.com/opensearch-project/OpenSearch/pull/18523))
 - Add cluster defaults for merge autoThrottle, maxMergeThreads, and maxMergeCount; Add segment size filter to the merged segment warmer ([#19629](https://github.com/opensearch-project/OpenSearch/pull/19629))