code: func ToETLState(s string) (ETLState, error) {
  	st := ETLState(s)
  	switch st {
  	case EtlOn:
  		return EtlOn, nil
  	case EtlOff:
  		return EtlOff, nil
  	default:
  		return EtlOff, fmt.Errorf("%s: %s", errUnrecognizedETLState, s)
  	}
  }
docs: // ToETLState converts the etl tag value (in string) to the corresponding ETLState