Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Elasticsearch: Remove support for EOL 6.6 version
  ElasticContainer: Upgrade V7_8 to elasticsearch 7.8.1
  ElasticContainer: Upgrade V6_8 to elasticsearch 6.8.11
  Fix gr-hovercard-behavior under Firefox
  Add entries to .gitignore of stable-3.0 that exist on master

Change-Id: Ifd8c9f544369e0d4a0274246ba10d1f74abb4261
tree: ded0c84ceaf1af4acb235d6acbaa540b8fb4f5de
  1. java/
  2. javatests/