/**
* Deletes all terms of given vocabularies.
*
* @param array $vids
* Array of vocabulary vid.
*/
protected function deleteVocabularyTerms($vids)
{
$tids = $this->vocabularyStorage->getToplevelTids($vids);
$terms = $this->termStorage->loadMultiple($tids);
$this->termStorage->delete($terms);
}