docs: def _next_page(self, offset):
          """Retrieves the next set of results from the service."""
          self._log.debug("Iterator c_record={}".format(self.c_record))
          param_dict = self.query_dict.copy()
          param_dict.update(
              {
                  'rows': '0',
                  'facet': 'true',
                  'facet.limit': str(self.page_size),
                  'facet.offset': str(offset),
                  'facet.zeros': 'false',
              }
          )
          print(param_dict)
          # resp_dict = self.client._get_query(**param_dict)
          resp_dict = self.client._post_query(**param_dict)
          # resp_dict = self.client.search(**param_dict)
          pprint.pprint(resp_dict)
          try:
              self.res = resp_dict['facet_counts']['facet_fields'][self.field]
              self._log.debug(self.res)
          except Exception:
              self.res = []
          self.index = 0