code: public AggregateOperator<T> max (int field) {
  		return this.aggregate (Aggregations.MAX, field, Utils.getCallLocationName());
  	}
docs: Syntactic sugar for aggregate (MAX, field).
  @param field The index of the Tuple field on which the aggregation function is applied.
  @return An AggregateOperator that represents the max'ed DataSet.
  
  @see org.apache.flink.api.java.operators.AggregateOperator