code: func (o *Cluster) SetJobFlowRole(v *string) *Cluster {
  	if o.JobFlowRole = v; o.JobFlowRole == nil {
  		o.nullFields = append(o.nullFields, "JobFlowRole")
  	}
  	return o
  }
docs: // SetJobFlowRole sets the IAM role that will be adopted by the launched EC2 instances