code: public Observable<NetworkInterfaceIPConfigurationInner> getVirtualMachineScaleSetIpConfigurationAsync(String resourceGroupName, String virtualMachineScaleSetName, String virtualmachineIndex, String networkInterfaceName, String ipConfigurationName) {
          return getVirtualMachineScaleSetIpConfigurationWithServiceResponseAsync(resourceGroupName, virtualMachineScaleSetName, virtualmachineIndex, networkInterfaceName, ipConfigurationName).map(new Func1<ServiceResponse<NetworkInterfaceIPConfigurationInner>, NetworkInterfaceIPConfigurationInner>() {
              @Override
              public NetworkInterfaceIPConfigurationInner call(ServiceResponse<NetworkInterfaceIPConfigurationInner> response) {
                  return response.body();
              }
          });
      }
docs: Get the specified network interface ip configuration in a virtual machine scale set.
  
  @param resourceGroupName The name of the resource group.
  @param virtualMachineScaleSetName The name of the virtual machine scale set.
  @param virtualmachineIndex The virtual machine index.
  @param networkInterfaceName The name of the network interface.
  @param ipConfigurationName The name of the ip configuration.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the NetworkInterfaceIPConfigurationInner object