Merge branch 'stable-2.14' into stable-2.15

* stable-2.14:
  ElasticIndexVersionDiscovery: Convert to Java stream API
  ElasticVersionManager: Use correct configuration value for prefix
  Elasticsearch: Refactor generation of bulk requests
  Rename AbstractReindexIT to AbstractReindexTests
  ElasticReindexIT: Use @ConfigSuite.Default instead of @ConfigSuite.Config

UpdateRequest, added in I7156bc1e3 ("Elasticsearch: Refactor generation of
bulk requests"), is adapted to the removal of FillArgs in I0785c7e2c.

Change-Id: I30c8e259416e3acd6b61b1623e3a79fff3465edd
tree: cd85540d810e29187adbd7045c98eadd734c565b
  1. gerrit-acceptance-tests/
  2. gerrit-elasticsearch/
  3. gerrit-pgm/