Patch release corresponding with Elastic Stack version 7.16.1 that addresses the Apache Log4j2 vulnerability, more information.
Client
The only changes in the client since 7.16.0 are a few minor updates for the Compatibility mode with 8.0. We added the compatibility header in 7.13.0, but now we have integration tests and compatibility tests for version 7.x of the client with Elasticsearch 8.0.