Update docs for Elasticsearch indexing tasks
requested to merge ce-11314-elasticsearch-rake-tasks-should-respect-new-elasticsearch-limited-namespaces-projects-functionality into master
What does this MR do?
Backport the docs changes from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/13437 for https://gitlab.com/gitlab-org/gitlab-ee/issues/11314
Does this MR meet the acceptance criteria?
Conformity
Edited by Markus Koller