public function getSuggestAdditionalTopResultsFields($defaultIfEmpty = [])
    {
        $additionalTopResultsFields = $this->getValueByPathOrDefaultValue('plugin.tx_solr.suggest.additionalTopResultsFields', '');
        if ($additionalTopResultsFields === '') {
            return $defaultIfEmpty;
        }

        return GeneralUtility::trimExplode(',', $additionalTopResultsFields, true);
    }