fix changelog

Signed-off-by: AnnTian Shao <[email protected]>

CHANGELOG.md

@@ -21,15 +21,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ## [Unreleased 2.x](https://github.com/opensearch-project/k-NN/compare/2.19...2.x)
 ### Features
 ### Enhancements
-- Introduced a writing layer in native engines where relies on the writing interface to process IO. (#2241)[https://github.com/opensearch-project/k-NN/pull/2241]
-- Allow method parameter override for training based indices (#2290) https://github.com/opensearch-project/k-NN/pull/2290]
-- Optimizes lucene query execution to prevent unnecessary rewrites (#2305)[https://github.com/opensearch-project/k-NN/pull/2305]
 - Added more detailed error messages for KNN model training (#2378)[https://github.com/opensearch-project/k-NN/pull/2378]
-- Add check to directly use ANN Search when filters match all docs. (#2320)[https://github.com/opensearch-project/k-NN/pull/2320]
-- Use one formula to calculate cosine similarity (#2357)[https://github.com/opensearch-project/k-NN/pull/2357]
-- Add WithFieldName implementation to KNNQueryBuilder (#2398)[https://github.com/opensearch-project/k-NN/pull/2398]
-- Make the build work for M series MacOS without manual code changes and local JAVA_HOME config (#2397)[https://github.com/opensearch-project/k-NN/pull/2397]
-- Remove DocsWithFieldSet reference from NativeEngineFieldVectorsWriter (#2408)[https://github.com/opensearch-project/k-NN/pull/2408]
 ### Bug Fixes
 * Fix derived source for binary and byte vectors [#2533](https://github.com/opensearch-project/k-NN/pull/2533/)
 * Fix the put mapping issue for already created index with flat mapper [#2542](https://github.com/opensearch-project/k-NN/pull/2542)