Add release notes (opensearch-project#784)

* Add release notes

Add release note for 2.15.0.
Prepare CHANGELOG for next release

Signed-off-by: Vijayan Balasubramanian <[email protected]>

* update release notes

Signed-off-by: Vijayan Balasubramanian <[email protected]>

---------

Signed-off-by: Vijayan Balasubramanian <[email protected]>

CHANGELOG.md

@@ -12,21 +12,11 @@ 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/neural-search/compare/2.14...2.x)
+## [Unreleased 2.x](https://github.com/opensearch-project/neural-search/compare/2.15...2.x)
 ### Features
-- Speed up NeuralSparseQuery by two-phase using a custom search pipeline.([#646](https://github.com/opensearch-project/neural-search/issues/646))
-- Support batchExecute in TextEmbeddingProcessor and SparseEncodingProcessor ([#743](https://github.com/opensearch-project/neural-search/issues/743))
 ### Enhancements
-- Pass empty doc collector instead of top docs collector to improve hybrid query latencies by 20% ([#731](https://github.com/opensearch-project/neural-search/pull/731))
-- Optimize parameter parsing in text chunking processor ([#733](https://github.com/opensearch-project/neural-search/pull/733))
-- Use lazy initialization for priority queue of hits and scores to improve latencies by 20% ([#746](https://github.com/opensearch-project/neural-search/pull/746))
-- Optimize max score calculation in the Query Phase of the Hybrid Search ([765](https://github.com/opensearch-project/neural-search/pull/765))
-- Implement parallel execution of sub-queries for hybrid search ([#749](https://github.com/opensearch-project/neural-search/pull/749))
 ### Bug Fixes
-- Total hit count fix in Hybrid Query ([756](https://github.com/opensearch-project/neural-search/pull/756))
-- Fix map type validation issue in multiple pipeline processors ([#661](https://github.com/opensearch-project/neural-search/pull/661))
 ### Infrastructure
-- Disable memory circuit breaker for integ tests ([#770](https://github.com/opensearch-project/neural-search/pull/770))
 ### Documentation
 ### Maintenance
 ### Refactoring

release-notes/opensearch-neural-search.release-notes-2.15.0.0.md

@@ -0,0 +1,18 @@
+## Version 2.15.0.0 Release Notes
+
+Compatible with OpenSearch 2.15.0
+
+### Features
+* Speed up NeuralSparseQuery by two-phase using a custom search pipeline.([#646](https://github.com/opensearch-project/neural-search/issues/646))
+* Support batchExecute in TextEmbeddingProcessor and SparseEncodingProcessor ([#743](https://github.com/opensearch-project/neural-search/issues/743))
+### Enhancements
+* Pass empty doc collector instead of top docs collector to improve hybrid query latencies by 20% ([#731](https://github.com/opensearch-project/neural-search/pull/731))
+* Optimize parameter parsing in text chunking processor ([#733](https://github.com/opensearch-project/neural-search/pull/733))
+* Use lazy initialization for priority queue of hits and scores to improve latencies by 20% ([#746](https://github.com/opensearch-project/neural-search/pull/746))
+* Optimize max score calculation in the Query Phase of the Hybrid Search ([765](https://github.com/opensearch-project/neural-search/pull/765))
+* Implement parallel execution of sub-queries for hybrid search ([#749](https://github.com/opensearch-project/neural-search/pull/749))
+### Bug Fixes
+* Total hit count fix in Hybrid Query ([756](https://github.com/opensearch-project/neural-search/pull/756))
+* Fix map type validation issue in multiple pipeline processors ([#661](https://github.com/opensearch-project/neural-search/pull/661))
+### Infrastructure
+* Disable memory circuit breaker for integ tests ([#770](https://github.com/opensearch-project/neural-search/pull/770))