CHANGELOG.md in aws-sdk-opensearchservice-1.20.0 vs CHANGELOG.md in aws-sdk-opensearchservice-1.21.0

@@ -1,7 +1,12 @@
 Unreleased Changes
 ------------------
 
+1.21.0 (2023-05-31)
+------------------
+
+* Feature - Code Generated Changes, see `./build_tools` or `aws-sdk-core`'s CHANGELOG.md for details.
+
 1.20.0 (2023-05-11)
 ------------------
 
 * Feature - This release fixes DescribePackages API error with null filter value parameter.