public function updateMetadata($contentId, MetadataUpdateStruct $struct)
{
$this->logger->logCall(__METHOD__, array('content' => $contentId, 'struct' => $struct));
$this->cache->getItem('content', 'info', $contentId)->set($contentInfo = $this->persistenceHandler->contentHandler()->updateMetadata($contentId, $struct))->save();
$this->cache->clear('content', $contentId, $contentInfo->currentVersionNo);
return $contentInfo;
}