code: def is_ready(self, node_id, metadata_priority=True):
          
          if not self._can_send_request(node_id):
              return False
  
          # if we need to update our metadata now declare all requests unready to
          # make metadata requests first priority
          if metadata_priority:
              if self._metadata_refresh_in_progress:
                  return False
              if self.cluster.ttl() == 0:
                  return False
          return True
docs: Check whether a node is ready to send more requests.
  
          In addition to connection-level checks, this method also is used to
          block additional requests from being sent during a metadata refresh.
  
          Arguments:
              node_id (int): id of the node to check
              metadata_priority (bool): Mark node as not-ready if a metadata
                  refresh is required. Default: True
  
          Returns:
              bool: True if the node is ready and metadata is not refreshing