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diff --git a/doc/integration/elasticsearch.md b/doc/integration/elasticsearch.md
index d4ec30e4938..60d6274cfce 100644
--- a/doc/integration/elasticsearch.md
+++ b/doc/integration/elasticsearch.md
@@ -426,6 +426,15 @@ There are several rake tasks available to you via the command line:
- Performs an Elasticsearch import that indexes the snippets data.
- [`sudo gitlab-rake gitlab:elastic:projects_not_indexed`](https://gitlab.com/gitlab-org/gitlab/blob/master/ee/lib/tasks/gitlab/elastic.rake)
- Displays which projects are not indexed.
+- [`sudo gitlab-rake gitlab:elastic:reindex_to_another_cluster[<SOURCE_CLUSTER_URL>,<DESTINATION_CLUSTER_URL>]`](https://gitlab.com/gitlab-org/gitlab/blob/master/ee/lib/tasks/gitlab/elastic.rake)
+ - Creates a new index in the destination cluster and triggers a [reindex from
+ remote](https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html#reindex-from-remote)
+ such that the index is fully copied from the source index. This can be
+ useful when you wish to perform a migration to a new cluster as this
+ reindexing should be quicker than reindexing via GitLab. Note that remote
+ reindex requires your source cluster to be whitelisted in your destination
+ cluster in Elasticsearch settings as per [the
+ documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html#reindex-from-remote).
### Environment Variables