Cleanup release 1.6.0 (opensearch-project#478)

* Cleanup release 1.6.0, prepare 1.7.0

Signed-off-by: xil <fridalu66@gmail.com>

* Fix 1.6.0 release note date

Signed-off-by: xil <fridalu66@gmail.com>

---------

Signed-off-by: xil <fridalu66@gmail.com>

Author: lucy66hw

CHANGELOG.md

@@ -4,10 +4,6 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 ### Added
-- Add support for double, int and long in BinaryFieldValue ([#460](https://github.com/opensearch-project/opensearch-protobufs/pull/460))
-- Add Create PIT support to protobuf generation ([#466](https://github.com/opensearch-project/opensearch-protobufs/pull/466)).
-- Add Delete PIT support to protobuf generation ([#468](https://github.com/opensearch-project/opensearch-protobufs/pull/468)).
-- Add PIT RPCs to `SearchService` ([#469](https://github.com/opensearch-project/opensearch-protobufs/pull/469)).
 
 ### Changed
 

release-notes/opensearch-protobufs.release-notes-1.6.0.md

@@ -0,0 +1,15 @@
+## Version 1.6.0 (2026-06-11) Release Notes
+
+### Added
+- Add support for double, int and long in BinaryFieldValue ([#460](https://github.com/opensearch-project/opensearch-protobufs/pull/460))
+- Add Create PIT support to protobuf generation ([#466](https://github.com/opensearch-project/opensearch-protobufs/pull/466)).
+- Add Delete PIT support to protobuf generation ([#468](https://github.com/opensearch-project/opensearch-protobufs/pull/468)).
+- Add PIT RPCs to `SearchService` ([#469](https://github.com/opensearch-project/opensearch-protobufs/pull/469)).
+
+### Changed
+
+### Removed
+
+### Fixed
+
+### Security

version.properties

@@ -1 +1 @@
-version=1.6.0
+version=1.7.0