public function getProgress()
    {
        $site = $this->getSite();
        if (is_null($site)) {
            return 0.0;
        }

        /** @var $indexService \ApacheSolrForTypo3\Solr\Domain\Index\IndexService */
        $indexService = $this->getInitializedIndexService($site);

        return $indexService->getProgress();
    }