Merge branch 'stable-3.1' into stable-3.2

* stable-3.1:
  ForRef#check should permit internal users to read all refs
  Add Jacek Centkowski to developers
  Add support for Elasticsearch version 7.10.*
  Add support for Elasticsearch version 7.9.*
  Align http dependencies with elasticsearch-rest-client

Change-Id: Ia708f5a927da3f8ec8beef2470abfcf011843d5c
tree: b112085b78dff813b57dbb81a8abe7722a58eefe
  1. java/
  2. javatests/