[{_id:1,name:"joe",likes:40,dislikes:7},{_id:2,name:"Ant",likes:60,dislikes:2}]

db.collection.aggregate([{$facet:{maxLikes:[{$sort:{likes:-1}},{$limit:1}],maxDislikes:[{$sort:{dislikes:-1}},{$limit:1}]},},{"$unwind":"$maxDislikes"},{"$unwind":"$maxLikes"}])