code: def shards(self, add_shard=False):
          
          url = self._service_url + 'shards/'
          if add_shard:
              response = requests.post(url, **self._instances._default_request_kwargs)
          else:
              response = requests.get(url, **self._instances._default_request_kwargs)
  
          return response.json()
docs: Get a list of shards belonging to this instance.
  
          :param bool add_shard: A boolean indicating whether to add a new shard to the specified
              instance.