Merge branch 'stable-2.15' into stable-2.16

* stable-2.15:
  Upgrade elasticsearch-rest-client to 7.3.2
  Add deleteChanges to list of supported permissions
  Remove obsolete permissions from gr-access-behavior
  Update git submodules

Change-Id: Ic7da6e8308c5323acbe70687fae8f793de470dbc
tree: 01305f047eeb09bd5558c83a06eb8fa2bd6cb6fb
  1. java/
  2. javatests/