code: def fetch(self, year, week, overwrite=False):
          
          self.config['overwrite_files'] = overwrite
          time_start = time.time()
          self._fetch_pageviews(self.storage, year, week, ip_users=False)
          self._fetch_downloads(self.storage, year, week, ip_users=False)
          # CDS has no user_agent before this date 1433400000:
          self._fetch_pageviews(self.storage, year, week, ip_users=True)
          self._fetch_downloads(self.storage, year, week, ip_users=True)
          logger.info('Fetch %s-%s in %s seconds.', year, week,
                      time.time() - time_start)
docs: Fetch PageViews and Downloads from Elasticsearch.