public function getIndexQueuePagesExcludeContentByClassArray($defaultIfEmpty = [])
    {
        $path = 'plugin.tx_solr.index.queue.pages.excludeContentByClass';
        $result = $this->getValueByPathOrDefaultValue($path, '');

        if (trim($result) === '') {
            return $defaultIfEmpty;
        }

        return GeneralUtility::trimExplode(',', $result);
    }