* stable-3.1:
Do not assume ES is running on localhost in tests
Simplify creation of Elasticsearch containers in tests
Add debug logs for automatic account creation case
Elasticsearch: Unharcode localhost for container's
Documentation: Group contribution links in How-to
Documentation: Fix contributions link in CLA page
Disable ElasticV{5,6,7}QueryChangesTest because of Issue 12524.
Change-Id: I303475cb81ad32fb65e3981a0d3549853340a4dd