// Populate the "t" (term) field with an array of all the grouped inserts' terms.
                BSONArrayBuilder tArrayBuilder(groupedInsertBuilder.subarrayStart("t"));
                for (auto groupingIterator = oplogEntriesIterator;
                     groupingIterator != endOfGroupableOpsIterator;
                     ++groupingIterator) {
                    tArrayBuilder.append(
                        static_cast<long long>((*groupingIterator)->getTerm().get()));
                }
                tArrayBuilder.done();