Add 2.11 release note (#519) (#525)

Signed-off-by: Heemin Kim <heemin@amazon.com>
(cherry picked from commit 059b10d)

Co-authored-by: Heemin Kim <heemin@amazon.com>

CHANGELOG.md

@@ -1,7 +1,8 @@
 # CHANGELOG
 All notable changes to this project are documented in this file.
 
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). See the [CONTRIBUTING guide](./CONTRIBUTING.md#Changelog) for instructions on how to add changelog entries.
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). 
+See the [CONTRIBUTING guide](./CONTRIBUTING.md#Changelog) for instructions on how to add changelog entries.
 
 ## [Unreleased 3.0](https://github.com/opensearch-project/geospatial/compare/2.x...HEAD)
 ### Features
@@ -12,12 +13,11 @@ 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/geospatial/compare/2.10...2.x)
+## [Unreleased 2.x](https://github.com/opensearch-project/geospatial/compare/2.11...2.x)
 ### Features
 ### Enhancements
 ### Bug Fixes
 ### Infrastructure
-* Add integration test against security enabled cluster ([#513](https://github.com/opensearch-project/geospatial/pull/513))
 ### Documentation
 ### Maintenance
 ### Refactoring

release-notes/opensearch-geospatial.release-notes-2.11.0.0.md

@@ -0,0 +1,9 @@
+## Version 2.11.0.0 Release Notes
+
+Compatible with OpenSearch 2.11.0
+
+### Bug Fixes
+* Fix flaky test, testIndexingMultiPolygon ([#483](https://github.com/opensearch-project/geospatial/pull/483))
+
+### Infrastructure
+* Add integration test against security enabled cluster ([#513](https://github.com/opensearch-project/geospatial/pull/513))