Merge branch 'stable-2.16'

* stable-2.16:
  Upgrade elasticsearch-rest-client to 6.5.1

Change-Id: I505af89e8c12efdb4c739a84c4aad645c805d213
tree: ffcbf78567e8555c4c237918d05e0dd298eccf97
  1. java/
  2. javatests/