[RayService] Use original ClusterIP for new head service (#2343)

Signed-off-by: kaihsun <[email protected]>

ray-operator/controllers/ray/rayservice_controller.go

@@ -989,9 +989,7 @@ func (r *RayServiceReconciler) reconcileServices(ctx context.Context, rayService
 		// ClusterIP is immutable. Starting from Kubernetes v1.21.5, if the new service does not specify a ClusterIP,
 		// Kubernetes will assign the ClusterIP of the old service to the new one. However, to maintain compatibility
 		// with older versions of Kubernetes, we need to assign the ClusterIP here.
-		if newSvc.Spec.ClusterIP == "" {
-			newSvc.Spec.ClusterIP = oldSvc.Spec.ClusterIP
-		}
+		newSvc.Spec.ClusterIP = oldSvc.Spec.ClusterIP
 
 		// TODO (kevin85421): Consider not only the updates of the Spec but also the ObjectMeta.
 		oldSvc.Spec = *newSvc.Spec.DeepCopy()