private function removeIdxSiteContentsByUids($siteUid, array $contentUids)
    {
        if (0 < count($contentUids)) {
            $this->getEntityManager()
                    ->createQuery('DELETE FROM BackBee\ClassContent\Indexes\IdxSiteContent i
                        WHERE i.site_uid=:site_uid
                        AND i.content_uid IN (:content_uids)')
                    ->setParameters(array(
                        'site_uid' => $siteUid,
                        'content_uids' => $contentUids, ))
                    ->execute();
        }

        return $this;
    }