/**
  * Retrieves article extension data.
  *
  * @param Article                       $entity
  * @param ProductDocument|VariantObject $document
  */
 protected function extractExtensionData(Article $entity, $document)
 {
     try {
         $document->setLongDescription($entity->getExtension()->getLongDesc());
     } catch (EntityNotFoundException $exception) {
         // No extension. Just ignore.
     }
 }