protected function getCleanSolrVersion($solrVersion)
    {
        $explodedSolrVersion = explode('.', $solrVersion);

        $shortSolrVersion = $explodedSolrVersion[0]
            . '.' . $explodedSolrVersion[1]
            . '.' . $explodedSolrVersion[2];

        return $shortSolrVersion;
    }