eZ\Publish\Core\Search\Elasticsearch\Content\CriterionVisitor\CustomField\CustomFieldIn::visitFilter PHP Method

    public function visitFilter(Criterion $criterion, Dispatcher $dispatcher, array $languageFilter)
    {
        $filter = array('nested' => array('path' => 'fields_doc', 'filter' => array('query' => array('bool' => array('should' => $this->getCondition($criterion), 'minimum_should_match' => 1)))));
        $fieldFilter = $this->getFieldFilter($languageFilter);
        if ($fieldFilter !== null) {
            $filter['nested']['filter'] = array('bool' => array('must' => array($fieldFilter, $filter['nested']['filter'])));
        }
        return $filter;
    }