lib/Handler.php
public function deleteContent($contentId, $versionId = null)
    {
        $idPrefix = $this->mapper->generateContentDocumentId($contentId);

        $this->gateway->deleteByQuery("_root_:{$idPrefix}*");
    }
public function deleteContent($contentId, $versionId = null)
    {
        $idPrefix = $this->mapper->generateContentDocumentId($contentId);

        $this->gateway->deleteByQuery("_root_:{$idPrefix}*");
    }
Deletes a content object from the index.

@param int $contentId
@param int|null $versionId