code: func (op *Operator) KeyringInstall(key string, q *WriteOptions) error {
  	r := op.c.newRequest("POST", "/v1/operator/keyring")
  	r.setWriteOptions(q)
  	r.obj = keyringRequest{
  		Key: key,
  	}
  	_, resp, err := requireOK(op.c.doRequest(r))
  	if err != nil {
  		return err
  	}
  	resp.Body.Close()
  	return nil
  }
docs: // KeyringInstall is used to install a new gossip encryption key into the cluster