Cherry-picking commits for 1.3 release from main to 1.x#345

Merged

AWSHurneyt merged 6 commits intoopensearch-project:1.xfrom AWSHurneyt:1.3release-1.X-port

Mar 11, 2022

+1,392-19

Commits on Mar 11, 2022

Added support for JDK 8 and 14. (opensearch-project#335 )
AWSHurneyt
committed
Added 1.3 release notes. (opensearch-project#336 )
AWSHurneyt
committed
Add backport and auto delete workflow (opensearch-project#339 )

Annie Lee
authored and
AWSHurneyt
committed
Implemented support for ClusterMetrics monitors (opensearch-project#221 ) (opensearch-project#342 )
AWSHurneyt
committed
Added cluster metrics monitor to release notes. (opensearch-project#343 )
AWSHurneyt
committed
Updated DEVELOPER_GUIDE.md and workflows to reference changes to the supported JDKs. (opensearch-project#338 )
AWSHurneyt
committed