/**
  * @param Event $event
  */
 public function onSolrError(Event $event)
 {
     $exceptionMessage = '';
     if ($event instanceof ErrorEvent) {
         $exceptionMessage = $event->getExceptionMessage();
     }
     $this->logger->error(sprintf('the error "%s" occure while executing event %s', $exceptionMessage, $event->getSolrAction()));
     if ($event->hasSourceEvent()) {
         $event->getSourceEvent()->stopPropagation();
     }
 }