code: public SingleOutputStreamOperator<T> min(int positionToMin) {
  		return aggregate(new ComparableAggregator<>(positionToMin, input.getType(), AggregationFunction.AggregationType.MIN, input.getExecutionConfig()));
  	}
docs: Applies an aggregation that that gives the minimum value of every window
  of the data stream at the given position.
  
  @param positionToMin The position to minimize
  @return The transformed DataStream.