code: 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();
              }
          });
      }
docs: Gets a virtual machine from a VM scale set.
  
  @param resourceGroupName The name of the resource group.
  @param vmScaleSetName The name of the VM scale set.
  @param instanceId The instance ID of the virtual machine.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the VirtualMachineScaleSetVMInner object