Merge branch 'stable-2.15' into stable-2.16
* stable-2.15:
ElasticContainer: Remove unneeded environment setting
Remove redundant "testName" methods from Elasticsearch tests
ElasticVersionTest: Add supportedVersion asserts for V7_0
Add support for Elasticsearch 7
Allow to set Elasticsearch number of shards and replicas
Discontinue support for Elasticsearch 2.4.x
ElasticSetting.Builder: Make methods return 'this'
Add link to security documentation for Elasticsearch 6.5
ElasticVersionTest: Add missing tests for 6.5.x
This merge also makes necessary changes related to the project index
which is not implemented on stable-2.15:
- Remove the tests for version 2.4.x
- Add tests for version 7
Change-Id: Id39158eb94aa71a8a5b22702ccc2009f4ce48b8c
