Mention Advanced Global Search in ES readme section

doc/README.md

@@ -163,8 +163,7 @@ have access to GitLab administration tools and settings.
 - [User cohorts](user/admin_area/user_cohorts.md) View user activity over time.
 - [Web terminals](administration/integration/terminal.md): Provide terminal access to environments from within GitLab.
 - **(EES/EEP)** [Audit logs and events](administration/audit_events.md): View the changes made within the GitLab server.
-- **(EES/EEP)** [Elasticsearch](integration/elasticsearch.md): Enable Elasticsearch,
-  a flexible, scalable and powerful search service to keep GitLab's search fast when dealing with huge amount of data.
+- **(EES/EEP)** [Elasticsearch](integration/elasticsearch.md): Enable Elasticsearch which powers GitLab's Advanced Global Search. Useful when you deal with a huge amount of data.
 - **(EES/EEP)** [Email users](tools/email.md): Email GitLab users from within GitLab.
 - **(EES/EEP)** [Limit project size](user/admin_area/settings/account_and_limit_settings.md): Set a hard limit for your repositories' size.
 - **(EEP)** [Auditor users](administration/auditor_users.md): Users with read-only access to all projects, groups, and other resources on the GitLab instance.