code: func (c *SearchCall) CancelationReason(cancelationReason string) *SearchCall {
  	c.urlParams_.Set("cancelation_reason", cancelationReason)
  	return c
  }
docs: // CancelationReason sets the optional parameter "cancelation_reason":
  //
  // Possible values:
  //   "CANCELED_EXPLICITLY"
  //   "TIMEOUT"