Add 2.9.0 release notes (#961)

Signed-off-by: Junqiu Lei <[email protected]> (cherry picked from commit 3e2a406)
opensearch-project · Jul 11, 2023 · 73e3932 · 73e3932
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -12,9 +12,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Maintenance
 ### Refactoring
 
-## [Unreleased 2.x](https://github.com/opensearch-project/k-NN/compare/2.8...2.x)
+## [Unreleased 2.x](https://github.com/opensearch-project/k-NN/compare/2.9...2.x)
 ### Features
-* Added efficient filtering support for Faiss Engine ([#936](https://github.com/opensearch-project/k-NN/pull/936))
 ### Enhancements
 ### Bug Fixes
 ### Infrastructure

diff --git a/release-notes/opensearch-knn.release-notes-2.9.0.0.md b/release-notes/opensearch-knn.release-notes-2.9.0.0.md
@@ -0,0 +1,6 @@
+## Version 2.9.0.0 Release Notes
+
+Compatible with OpenSearch 2.9.0
+
+### Features
+Added support for Efficient Pre-filtering for Faiss Engine ([#936](https://github.com/opensearch-project/k-NN/pull/936))