Create object of class "AggregFis"
Function to create an aggregation operator of class AggregFis to be used in Fusion
NewAggregFis(fis, output_index = 1)
fis
: FisPro::Fis object, The Fis to be used in the aggregation operatoroutput_index
: integer value, The index (1-based index) of the output in the Fis to be used in the aggregation (the default is 1)AggregFis object