Merge branch 'stable-2.15'

* stable-2.15:
  AbstractElasticIndex: Don't mention "change" in exception message
  Consistently import org.slf4j.LoggerFactory
  PluginLoader: Make Logger private
  Documentation: clarify latest IntelliJ version use
  Elasticsearch builders: fix the Eclipse warnings
  Remove stale references to no longer used jackson libraries
  Add 'docker' tag to build rules for Elasticsearch tests
  ReindexIT: Split Elasticsearch test out to a separate class

Change-Id: I1c11924d44c8fac18bba5aa4271d47aada851280
tree: fe7614e0cd63b68202b700b46607c26280bcab9e
  1. java/
  2. javatests/