private function reindexForWikiServiceUsingUgroup($ugroup_id, $project_id)
 {
     $wiki_perm_manager = new Wiki_PermissionsManager(PermissionsManager::instance(), ProjectManager::instance(), new UGroupLiteralizer());
     if ($wiki_perm_manager->isUgroupUsed($ugroup_id, $project_id)) {
         $this->getWikiSystemEventManager()->queueWikiProjectReindexation($project_id);
     }
 }