WriteResponse does not return GeneratedKeys

[GaikwadPratik]

Describe the bug
I am running below query

alert := dbEntities.Alert{
		Acknowledged:          false,
		AcknowledgedTimestamp: nil,
		AutoAcknowledged:      false,
		Class:                 alertClass,
		Count:                 1,
		Level:                 alertLevel,
		Message:               message,
		Ref:                   ref,
		Timestamp:             nil,
		Type:                  alertType,
		RuleId:                ruleId,
	}
res, err := r.Table(hConstant.TableAlert).Insert(alert).RunWrite(rethinkHelper.RethinkSession)

There is no error. In the res, it says inserted is 1 but GeneratedKeys slice is empty

To Reproduce
Steps to reproduce the behavior:

1. Create Database.
2. Create Table
3. run above query
4. Check the response object

Expected behavior
GeneratedKeys should have more than 0 value, specially generated id for inserted record

Screenshots

System info

• OS: [Ubuntu 18.04.6 LTS]
• RethinkDB Version: [2.4.2~0bionic (GCC 7.5.0)]