code: @Override
      public java.util.concurrent.Future<UnsubscribeResult> unsubscribeAsync(String subscriptionArn,
              com.amazonaws.handlers.AsyncHandler<UnsubscribeRequest, UnsubscribeResult> asyncHandler) {
  
          return unsubscribeAsync(new UnsubscribeRequest().withSubscriptionArn(subscriptionArn), asyncHandler);
      }
docs: Simplified method form for invoking the Unsubscribe operation with an AsyncHandler.
  
  @see #unsubscribeAsync(UnsubscribeRequest, com.amazonaws.handlers.AsyncHandler)