code: @Override
  	public AppEngineGetScalar<E, R> sort(Order<?, ?>... orders) {
  		if (orders == null) {
  			throw new IllegalArgumentException("'orders' must not be [" + orders + "]");
  		}
  		
  		this.orders = orders;
  		return this;
  	}
docs: Specifies sort orders which the list passed to
  {@code Aggregation#aggregate(java.util.List)} is sorted by.
  
  @param orders The sort orders which the list passed to
  {@code Aggregation#aggregate(java.util.List)} is sorted by.
  @return The {@code GetScalar} which the sort orders have been specified.