increase indexer version to reforce rebuild for the new title index

lib/exe/indexer.php

@@ -12,7 +12,7 @@ session_write_close();  //close session
 if(!defined('NL')) define('NL',"\n");
 
 // Version tag used to force rebuild on upgrade
-define('INDEXER_VERSION', 2);
+define('INDEXER_VERSION', 3);
 
 // keep running after browser closes connection
 @ignore_user_abort(true);