Merge branch 'stable-3.1'

* stable-3.1:
  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: I6ecaf78332c7c444205fd85b3f74fd77927c88b7
tree: 25f9d477d2f6a620c192d58b2337d1925f820f0a
  1. java/
  2. javatests/