code: func (s *NodesStatsService) NodeId(nodeId ...string) *NodesStatsService {
  	s.nodeId = append(s.nodeId, nodeId...)
  	return s
  }
docs: // NodeId is a list of node IDs or names to limit the returned information;
  // use `_local` to return information from the node you're connecting to,
  // leave empty to get information from all nodes.