Failed Kubernetes job node pool selector

affinity.go

j := &batch.Job{
    Spec: batch.JobSpec{
        Template: core.PodTemplateSpec{
            Spec: core.PodSpec{
                Affinity: &core.Affinity{
                    NodeAffinity: &core.NodeAffinity{
                        RequiredDuringSchedulingIgnoredDuringExecution: &core.NodeSelector{
                            NodeSelectorTerms: []core.NodeSelectorTerm{
                                {
                                    MatchExpressions: []core.NodeSelectorRequirement{
                                        {
                                            Key:      "cloud.google.com/gke-nodepool",
                                            Values:   []string{"dl-pool"},
                                            Operator: core.NodeSelectorOpIn,
                                        },
                                    },
                                },
                            },
                        },
                    },
                },
            },
        },
    },
}

example.go

jobSpec := &batch.Job{
    Spec: batch.JobSpec{
        Selector: &meta.LabelSelector{
            MatchLabels: map[string]string{
                "cloud.google.com/gke-nodepool": "dl-pool",
            },
        },
    },
}

j, err := k8.jobclient.Create(jobSpec)
if err != nil {
    fmt.Print(err)
    return nil, err
}

// 	Job.batch "dl-a4206a2b-f88d-4cac-9c83-5a7b446b7499-geyjteey9pp" is invalid: 
// 	[
//     spec.selector: Invalid value: v1.LabelSelector{
//         MatchLabels:map[string]string{"cloud.google.com/gke-nodepool":"dl-pool", "controller-uid":"f364be13-eedb-11e9-8c5c-42010a960113"}, 
//         MatchExpressions:[]v1.LabelSelectorRequirement(nil)
//     }: `selector` not auto-generated, 
//     spec.template.metadata.labels: Invalid value: map[string]string{
//         "job-name":"dl-a4206a2b-f88d-4cac-9c83-5a7b446b7499-geyjteey9pp",
//         "controller-uid":"f364be13-eedb-11e9-8c5c-42010a960113",
//         "jobName":"dl-a4206a2b-f88d-4cac-9c83-5a7b446b7499-geyjteey9pp",
//         "podType":"download-job"
//     }: `selector` does not match template `labels`
// 	]