[{"addr":"address1","book":"book1",points:34},{"addr":"address2","book":"book1",points:340},{"addr":"address1","book":"book5",points:3400},{"addr":"address1","book":"book2",points:2340},{"addr":"address3","book":"book9",points:1340},{"addr":"address2","book":"book5",points:140},{"addr":"address2","book":"book1",points:1400},{"addr":"address1","book":"book1",points:2400},{"addr":"address15","book":"book1",points:310},{"addr":"address9","book":"book99",points:130},{"addr":"address90","book":"book33",points:1370}]

db.collection.aggregate([{$project:{_id:0,name:1,points:1,level:{$switch:{branches:[{case:{$lte:["$points",250]},then:1},{case:{$lt:["$points",500]},then:2},{case:{$lt:["$points",3000]},then:3},],default:4}}}}])