Align manual proto with generated proto - searchrequest & search response (opensearch-project#154)

* Align manual proto with generated proto - search

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

Author: lucy66hw

CHANGELOG.md

@@ -6,6 +6,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Added
 
 ### Changed
+- Align manual proto with generated proto - search ([#154](https://github.com/opensearch-project/opensearch-protobufs/pull/154))
 
 ### Removed