code: public Observable<DscNodeInner> getAsync(String resourceGroupName, String automationAccountName, String nodeId) {
          return getWithServiceResponseAsync(resourceGroupName, automationAccountName, nodeId).map(new Func1<ServiceResponse<DscNodeInner>, DscNodeInner>() {
              @Override
              public DscNodeInner call(ServiceResponse<DscNodeInner> response) {
                  return response.body();
              }
          });
      }
docs: Retrieve the dsc node identified by node id.
  
  @param resourceGroupName Name of an Azure Resource group.
  @param automationAccountName The name of the automation account.
  @param nodeId The node id.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the DscNodeInner object