Merge branch 'stable-3.0'

* stable-3.0:
  ElasticV7QueryProjectsTest: Use V7_4
  Add support for Elasticsearch version 7.4.*

Change-Id: Ie9745efc751d5e073003ce9393e847ca97433a41
tree: bc7fd57f5016366a2d281909cfd9cf315434ce4b
  1. java/
  2. javatests/