Ojs\SiteBundle\Controller\ExploreController::indexAction PHP Method

    public function indexAction(Request $request, $page = 1)
    {
        $getTypes = $request->query->get('type_filters');
        $getLocales = $request->query->get('locale_filters');
        $getSubjects = $request->query->get('subject_filters');
        $getPublishers = $request->query->get('publisher_filters');
        $typeFilters = !empty($getTypes) ? explode(',', $getTypes) : [];
        $localeFilters = !empty($getLocales) ? explode(',', $getLocales) : [];
        $subjectFilters = !empty($getSubjects) ? explode(',', $getSubjects) : [];
        $publisherFilters = !empty($getPublishers) ? explode(',', $getPublishers) : [];
        $journalSearcher = $this->get('fos_elastica.index.search.journal');
        $boolQuery = new Query\BoolQuery();
        if (!empty($typeFilters) || !empty($localeFilters) || !empty($subjectFilters) || !empty($publisherFilters)) {
            foreach ($typeFilters as $type) {
                $match = new Query\Match();
                $match->setField('journal.publisher.publisherType.name', $type);
                $boolQuery->addMust($match);
            }
            foreach ($subjectFilters as $subject) {
                $match = new Query\Match();
                $match->setField('subjects.subject', $subject);
                $boolQuery->addMust($match);
            }
            foreach ($publisherFilters as $publisher) {
                $match = new Query\Match();
                $match->setField('journal.publisher.name', $publisher);
                $boolQuery->addMust($match);
            }
            foreach ($localeFilters as $locale) {
                $match = new Query\Match();
                $match->setField('mandatoryLang', $locale);
                $boolQuery->addMust($match);
            }
        }
        $journalQuery = new Query($boolQuery);
        $journalQuery->setSort(['journal.title.raw' => 'asc']);
        $typeAgg = new Aggregation\Terms('types');
        $typeAgg->setField('journal.publisher.publisherType.name');
        $typeAgg->setSize(0);
        $journalQuery->addAggregation($typeAgg);
        $localeAgg = new Aggregation\Terms('locales');
        $localeAgg->setField('mandatoryLang');
        $localeAgg->setSize(0);
        $journalQuery->addAggregation($localeAgg);
        $subjectAgg = new Aggregation\Terms('subjects');
        $subjectAgg->setField('subjects.subject');
        $subjectAgg->setSize(0);
        $journalQuery->addAggregation($subjectAgg);
        $publisherAgg = new Aggregation\Terms('publishers');
        $publisherAgg->setField('journal.publisher.name');
        $publisherAgg->setSize(0);
        $journalQuery->addAggregation($publisherAgg);
        $adapter = new ElasticaAdapter($journalSearcher, $journalQuery);
        $pagerfanta = new Pagerfanta($adapter);
        $pagerfanta->setMaxPerPage(20);
        $pagerfanta->setCurrentPage($page);
        $journals = $pagerfanta->getCurrentPageResults();
        $types = $adapter->getResultSet()->getAggregation('types')['buckets'];
        $locales = $adapter->getResultSet()->getAggregation('locales')['buckets'];
        $subjects = $adapter->getResultSet()->getAggregation('subjects')['buckets'];
        $publishers = $adapter->getResultSet()->getAggregation('publishers')['buckets'];
        $data = ['types' => $types, 'locales' => $locales, 'journals' => $journals, 'subjects' => $subjects, 'publishers' => $publishers, 'type_filters' => $typeFilters, 'locale_filters' => $localeFilters, 'subject_filters' => $subjectFilters, 'publisher_filters' => $publisherFilters, 'pagerfanta' => $pagerfanta, 'page' => 'explore', 'search_section' => 'journal'];
        return $this->render('OjsSiteBundle:Explore:index.html.twig', $data);
    }