// operation will fail.  If not specified, a port will be allocated if this
  // Service requires one.  If this field is specified when creating a
  // Service which does not need it, creation will fail. This field will be
  // wiped when updating a Service to no longer need it (e.g. changing type
  // from NodePort to ClusterIP).
  // More info: https://kubernetes.io/docs/concepts/services-networking/service/#type-nodeport
  // +optional