build to 7.8.1 Elasticsearch

Fix PR link format for 1.13.0.0 release notes (opendistro-for-elastic…

…search#345)

Bump version to 1.12.0.2

Bump version to 1.12.0.1

change format of setenv (opendistro-for-elasticsearch#301)

* set-env removed
https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-commands-for-github-actions#environment-files

* enbale usecluster in alerting build.gradle

Bump version to 1.11.0.1 (opendistro-for-elasticsearch#280)

Update version to 1.11.0.0

Update 1.10.1.1 release notes for version 1.10.1.2 (opendistro-for-el…

…asticsearch#257)

* Update 1.10.1.1 release notes for version 1.10.1.2

* Update version number in release note file

Update 1.10.1.0 release notes for version 1.10.1.1 (opendistro-for-el…

…asticsearch#253)

Adds support for Elasticsearch 7.9.1 (opendistro-for-elasticsearch#251)