Cleanup release 1.2.0, prepare 1.3.0 (#372)

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: lucy66hw <178352792+lucy66hw@users.noreply.github.com>

Author: github-actions[bot]

CHANGELOG.md

@@ -4,16 +4,11 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 ### Added
-- Add local Protobuf conversion instructions to README ([#362](https://github.com/opensearch-project/opensearch-protobufs/pull/362))
-- Add in-place rename support for oneOf fields in post-processing ([#363](https://github.com/opensearch-project/opensearch-protobufs/pull/363))
-- Use official openapi-generator tool ([#364](https://github.com/opensearch-project/opensearch-protobufs/pull/364))
 
 ### Changed
 
 ### Removed
-- Manual remove `BoostingQuery`, `DisMaxQuery`, `QueryStringQuery`, `SimpleQueryStringQuery`, `IntervalsQuery` and `ScriptScoreQuery` ([#367](https://github.com/opensearch-project/opensearch-protobufs/pull/367))
 
 ### Fixed
 
 ### Security
-- Upgrade dependencies to address security vulnerabilities ([#368](https://github.com/opensearch-project/opensearch-protobufs/pull/368))

release-notes/opensearch-protobufs.release-notes-1.2.0.md

@@ -0,0 +1,16 @@
+## Version 1.2.0 (2026-01-22) Release Notes
+
+### Added
+- Add local Protobuf conversion instructions to README ([#362](https://github.com/opensearch-project/opensearch-protobufs/pull/362))
+- Add in-place rename support for oneOf fields in post-processing ([#363](https://github.com/opensearch-project/opensearch-protobufs/pull/363))
+- Use official openapi-generator tool ([#364](https://github.com/opensearch-project/opensearch-protobufs/pull/364))
+
+### Changed
+
+### Removed
+- Manual remove `BoostingQuery`, `DisMaxQuery`, `QueryStringQuery`, `SimpleQueryStringQuery`, `IntervalsQuery` and `ScriptScoreQuery` ([#367](https://github.com/opensearch-project/opensearch-protobufs/pull/367))
+
+### Fixed
+
+### Security
+- Upgrade dependencies to address security vulnerabilities ([#368](https://github.com/opensearch-project/opensearch-protobufs/pull/368))

version.properties

@@ -1 +1 @@
-version=1.2.0
+version=1.3.0