code: public function visit(Criterion $criterion, CriterionVisitor $subVisitor = null)
      {
          return '(' .
              implode(
                  ' OR ',
                  array_map(
                      function ($value) {
                          return 'content_id_id:"' . $value . '"';
                      },
                      $criterion->value
                  )
              ) .
              ')';
      }
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