public function mergeSolrConfiguration(array $configurationToMerge, $addKeys = true, $includeEmptyValues = true, $enableUnsetFeature = true)
    {
        $data = $this->configurationAccess->getData();
        ArrayUtility::mergeRecursiveWithOverrule(
            $data['plugin.']['tx_solr.'],
            $configurationToMerge,
            $addKeys,
            $includeEmptyValues,
            $enableUnsetFeature
        );

        $this->configurationAccess->setData($data);

        return $this;
    }