Merge branch 'es_fix_documentation' into 'master'

Fix ES documentation

@axil Since we changed default behaviour (https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/209) we need to update doc.

See merge request !243

doc/integration/elasticsearch.md

@@ -250,11 +250,12 @@ To minimize downtime of the search feature we recommend the following:
 
 1. Enable Elasticsearch and restart GitLab.
 
-1. Run indexers for database, wikis, and repositories. By running the repository
-   indexer twice you will be sure that everything is indexed because some
-   commits could be pushed while you performed initial indexing. The repository
-   indexer will skip repositories and commits that are already indexed, so it
-   will be much shorter than the first run.
+1. Run indexers for database (with the `UPDATE_INDEX=1` parameter), wikis, and
+   repositories. By running  the repository indexer twice you will be sure that
+   everything is indexed because some commits could be pushed while you
+   performed the initial indexing. The repository indexer will skip
+   repositories and commits that are already indexed, so it will be much
+   shorter than the first run.
 
 [ee-109]: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/109 "Elasticsearch Merge Request"
 [elasticsearch]: https://www.elastic.co/products/elasticsearch "Elasticsearch website"