Merge branch 'stable-2.15'

* stable-2.15:
  Set version to 2.14.13
  Modify search autocompletion to include only email
  ElasticContainer: Use Elasticsearch 5.6.12 for V5_6 tests
  Add link to security documentation for Elasticsearch 6.4
  Link to homepage for Elasticsearch compatibility
  GerritServer#initAndStart: Remove unnecessary instantiation of Config
  Revert "Suppress "unlikely argument type" warnings for IdString"
  IdString: Don't compare equal to strings

Change-Id: I9b0db056eb4455a7c430779c6e8666bd770da072
tree: 3e542df3fa96080f6028e2417c73101e748f48da
  1. java/
  2. javatests/