code: public function visit(Criterion $criterion, CriterionVisitor $subVisitor = null)
      {
          $values = array();
          foreach ($criterion->value as $value) {
              $values[] = 'priority_i:"' . $value . '"';
          }
  
          return '(' . implode(' OR ', $values) . ')';
      }
docs: Map field value to a proper Solr representation.
  
  @param \eZ\Publish\API\Repository\Values\Content\Query\Criterion $criterion
  @param \EzSystems\EzPlatformSolrSearchEngine\Query\CriterionVisitor $subVisitor
  
  @return string