docs: public Observable<VirtualMachineScaleSetVMInner> getAsync(String resourceGroupName, String vmScaleSetName, String instanceId) {
          return getWithServiceResponseAsync(resourceGroupName, vmScaleSetName, instanceId).map(new Func1<ServiceResponse<VirtualMachineScaleSetVMInner>, VirtualMachineScaleSetVMInner>() {
              @Override
              public VirtualMachineScaleSetVMInner call(ServiceResponse<VirtualMachineScaleSetVMInner> response) {
                  return response.body();
              }
          });
      }