code: public function receive(Signal $signal)
      {
          if (!$signal instanceof Signal\ContentService\RemoveTranslationSignal) {
              return;
          }
  
          $contentInfo = $this->persistenceHandler->contentHandler()->loadContentInfo(
              $signal->contentId
          );
          if (!$contentInfo->isPublished) {
              return;
          }
  
          $this->searchHandler->indexContent(
              $this->persistenceHandler->contentHandler()->load(
                  $contentInfo->id,
                  $contentInfo->currentVersionNo
              )
          );
      }
docs: Receive the given $signal and react on it.
  
  @param \eZ\Publish\Core\SignalSlot\Signal $signal