[{"_id":"5e4aaadefrbff2150c42ed5b","data":[{"time":"15:24:31","amount":"34"},{"time":"15:24:33","amount":"38"},{"time":"15:24:35","amount":"95"}],"code":"S04","rollnumber":4,"intime":"2020-02-16T12:24:21.921Z"},{"_id":"5e4aaadefrbff2150c42ed5a","data":[{"time":"15:24:31","amount":"34"},{"time":"15:24:33","amount":"38"},{"time":"15:24:35","amount":"95"}],"code":"S04","rollnumber":41,"intime":"2020-02-16T12:24:21.921Z"},{"_id":"5e4aaadefrbff2150c42ed5c","data":[{"time":"15:24:31","amount":"34"},{"time":"15:24:33","amount":"38"},{"time":"15:24:35","amount":"100"}],"code":"S04","rollnumber":4,"intime":"2020-02-16T12:24:21.921Z"}]

db.collection.aggregate([{$match:{code:"S04",rollnumber:4}},{$project:{_id:0,data:{$slice:["$data",-1]}}}])