Add Elasticsearch related features
Do not merge until https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2375 is merged.
Edited by Achilleas Pipinellis
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Do not merge until https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2375 is merged.