/**
  * @return bool
  */
 public function execute()
 {
     $objIndex = new class_module_search_indexwriter();
     //start with deletions
     $objQueue = new class_search_indexqueue();
     foreach ($objQueue->getRows(class_search_enum_indexaction::DELETE()) as $arrRow) {
         $objIndex->removeRecordFromIndex($arrRow["search_queue_systemid"]);
         $objQueue->deleteBySystemid($arrRow["search_queue_systemid"]);
     }
     //index objects
     foreach ($objQueue->getRows(class_search_enum_indexaction::INDEX(), 0, $this->intMaxObjectsPerRun) as $arrRow) {
         $objIndex->indexObject(class_objectfactory::getInstance()->getObject($arrRow["search_queue_systemid"]));
         $objQueue->deleteBySystemidAndAction($arrRow["search_queue_systemid"], class_search_enum_indexaction::INDEX());
     }
     //reschedule for the next run
     return false;
 }