public function getFileContentFromIndex($hash = "")
    {
        $fileContent = false;

        $queryBuilder = Db::getQueryBuilder('tx_kesearch_index');
        $queryBuilder->getRestrictions()->removeAll();
        $hashRow = $queryBuilder
            ->select('*')
            ->from('tx_kesearch_index')
            ->where(
                $queryBuilder->expr()->eq(
                    'hash',
                    $queryBuilder->quote($hash, \PDO::PARAM_STR)
                )
            )
            ->setMaxResults(1)
            ->execute()
            ->fetch();

        if (is_array($hashRow)) {
            $fileContent = $hashRow['content'];
        }

        return $fileContent;
    }