code: def _get_query(self, cursor):
          '''
          Query tempalte for source Solr, sorts by id by default.
          '''
          query = {'q':'*:*',
                  'sort':'id desc',
                  'rows':self._rows,
                  'cursorMark':cursor}
          if self._date_field:
              query['sort'] = "{} asc, id desc".format(self._date_field)
          if self._per_shard:
              query['distrib'] = 'false'
          return query