'Need to add method parameters with each iteration in java

In the below piece of code I need to add arguments inside fields method with each iteration.

  for(int i=0; i< groups.size(); i++) {
            project = Aggregates.project(fields(computed(groups.get(i), "$_id." + groups.get(i)), include("productId", "productName")));
        }

i.e., in the second iteration the line of code inside for loop should be the one as below.

for(int i=0; i< groups.size(); i++) {
            project = Aggregates.project(fields(computed(groups.get(i), "$_id." + groups.get(i)), computed(groups.get(i+1), "$_id." + groups.get(i+1)), include("productId", "productName")));
        }

Can someone help on this?

javamongodbgroup-byprojectaggregates


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