Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Report to Checks when the build starts
  ElasticContainer: Upgrade V7_6 to elasticsearch 7.6.2
  ElasticContainer: Upgrade V6_8 to elasticsearch 6.8.8

Change-Id: I230da7bbb73bf6341bcc81867852bb02d24f2853
tree: bb91469b72ee3b948d81998646aed2934ba223d7
  1. java/
  2. javatests/