public function getIndexQueueAdditionalWhereClauseByConfigurationName($configurationName)
    {
        $path = 'plugin.tx_solr.index.queue.' . $configurationName . '.additionalWhereClause';
        $additionalWhere = $this->getValueByPathOrDefaultValue($path, '');

        if (trim($additionalWhere) === '') {
            return '';
        }

        return ' AND ' . $additionalWhere;
    }