code: protected function buildTreeRequest($language, $siteId)
      {
          $qa = $this->createAggregationQueryBuilderWithSiteIdAndLanguage($siteId, $language);
          $qa->match(
              array(
                  'status.publishedState' => true,
                  'deleted' => false,
              )
          );
  
          return $qa;
      }
docs: @param string $language
  @param string $siteId
  
  @return Stage