[{_id:"1",total_vote:142,count:23},{_id:"11",total_vote:50,count:1},{_id:"2",total_vote:320,count:160},{_id:"3",total_vote:94,count:47},{_id:"4",total_vote:120,count:60},{_id:"5",total_vote:650,count:13},{_id:"7",total_vote:350,count:7},{_id:"8",total_vote:102,count:2}]

db.collection.aggregate([{"$addFields":{newId:{$toInt:"$_id"}}},{"$sort":{newId:1}},{$project:{newId:0}}])