config-gerrit: Reword index.type section about Elasticsearch

Change-Id: I85bb89299b92b55aca5937bd07adb67cf5778053
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 3ecf02d..3b9fae0 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -2648,7 +2648,8 @@
 * `ELASTICSEARCH` look into link:#elasticsearch[Elasticsearch section]
 +
 An link:https://www.elastic.co/products/elasticsearch[Elasticsearch] index is
-used.
+used. Refer to the link:#elasticsearch[Elasticsearch section] for further
+configuration details.
 
 +
 By default, `LUCENE`.