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