What's new in Gerrit 2.8: More information about the secondary index

Mention that Lucene and Solr are supported, and that the secondary
index is currently optional but will be mandatory from 2.9.

Change-Id: I49e9bec8ceb9e86e323376480a698f45ee4aa721
diff --git a/presentations/gerrit-new-features-2.8/gerrit-new-features-2.8.txt b/presentations/gerrit-new-features-2.8/gerrit-new-features-2.8.txt
index c2d8586..e038e64 100644
--- a/presentations/gerrit-new-features-2.8/gerrit-new-features-2.8.txt
+++ b/presentations/gerrit-new-features-2.8/gerrit-new-features-2.8.txt
@@ -64,9 +64,14 @@
 
 == Improved performance of change queries
 
-The change search in Gerrit is now backed by a Lucene index which can
+The change search in Gerrit is now backed by a secondary index which can
 deliver results much faster than the database.
 
+Lucene and Solr indexes are supported.
+
+In 2.8 the secondary index is optional, but from 2.9 it will be mandatory
+and the default will be Lucene.
+
 == New search operators
 
 * New link:https://gerrit-documentation.storage.googleapis.com/Documentation/2.8/user-search.html#file[