ElasticContainer: Use Elasticsearch 5.6.12 for V5_6 tests

Change-Id: Icb85272a3c1d68700d7b251d643c8640a82adfb7
1 file changed
tree: 31886bed6dd499b65157c6847de9526fcfa8bfa5
  1. gerrit-acceptance-tests/
  2. gerrit-elasticsearch/
  3. gerrit-pgm/