Inheritance: extends Elastica\Exception\BulkException
 /**
  * Check if $exception is a bulk response exception that just contains
  * document is missing failures.
  *
  * @param ResponseException $exception exception to check
  * @param callback|null $logCallback Callback in which to do some logging.
  *   Callback will be passed the id of the missing document.
  * @return bool
  */
 protected function bulkResponseExceptionIsJustDocumentMissing(ResponseException $exception, $logCallback = null)
 {
     $justDocumentMissing = true;
     foreach ($exception->getResponseSet()->getBulkResponses() as $bulkResponse) {
         if (!$bulkResponse->hasError()) {
             continue;
         }
         $pos = strpos($bulkResponse->getError(), 'DocumentMissingException');
         if ($pos === false) {
             $justDocumentMissing = false;
         } elseif ($logCallback) {
             // This is generally not an error but we should
             // log it to see how many we get
             $id = $bulkResponse->getAction()->getData()->getId();
             call_user_func($logCallback, $id);
         }
     }
     return $justDocumentMissing;
 }