CronJob：未知字段“configMapRef”

我正在申请Kubernetes CronJob。到目前为止它的作用。现在我想添加环境变量。（env：-name ...见下文）尝试申请时我得到了错误

io.k8s.api.core.v1.EnvVarSource中的未知字段“configMapRef”

我不喜欢在这里设置所有单曲变量。我更喜欢将configmap链接到不使变量加倍。如何设置CronJob文件中configmap.yaml变量的链接，如何编码？

apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: ad-sync
creationTimestamp: 2019-02-15T09:10:20Z
namespace: default
selfLink: /apis/batch/v1beta1/namespaces/default/cronjobs/ad-sync
spec:
concurrencyPolicy: Allow
failedJobsHistoryLimit: 1
successfulJobsHistoryLimit: 3
suspend: false
schedule: "0 /1 "
jobTemplate:

metadata:
  labels:
    job: ad-sync
spec:
  template:
    spec:
      containers:
      - name: ad-sync
        image: foo.azurecr.io/foobar/ad-sync
        command: ["dotnet", "AdSyncService.dll"]
        args: []
        env:
          - name: AdSyncService
            valueFrom:
              configMapRef:
                name: ad-sync-service-configmap
      restartPolicy: OnFailure