kind: IstioOperator
metadata:
  namespace: external-istiod
spec:
  profile: external
  values:
    global:
      istioNamespace: external-istiod
      configCluster: true
    pilot:
      configMap: true
    istiodRemote:
      injectionURL: https://${EXTERNAL_ISTIOD_ADDR}:15017/inject/:ENV:cluster=${REMOTE_CLUSTER_NAME}:ENV:net=network1
    base:
      validationURL: https://${EXTERNAL_ISTIOD_ADDR}:15017/validate

I used this code(from istio's official site)to "Set up the remote config cluster" when I apply the yaml file I'm getting error:"configCluster" not identified in istio.io/v1alpha1"

Why am I getting as not identified please guide me on this.