Fix ES documentation
@axil Since we changed default behaviour (https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/209) we need to update doc.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
@axil Since we changed default behaviour (https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/209) we need to update doc.