[{"_id":0,"url":"localhost:8080/path1/","proxy":{"proxy":"196.0.1.1:1500","protocol":"http"},"success":false},{"_id":1,"url":"localhost:8080/path2/","proxy":{"proxy":"196.0.1.1:1500","protocol":"http"},"success":true},{"_id":2,"url":"localhost:8080/path3/","proxy":{"proxy":"192.168.255.255:1500","protocol":"http"},"success":true},{"_id":3,"url":"localhost:8080/path4/","proxy":{"proxy":"192.168.255.255:1500","protocol":"http"},"success":true}]

db.collection.aggregate([{"$set":{"success":{"$cond":["$success",{"true-count":1,"false-count":0},{"true-count":0,"false-count":1}]}}},{"$group":{"_id":"$proxy.proxy","true-count":{"$sum":"$success.true-count"},"false-count":{"$sum":"$success.false-count"}}},{"$set":{"success":[{"count":"$true-count","success":true},{"count":"$false-count","success":false}]}},{"$unwind":{"path":"$success"}},{"$project":{"_id":0,"proxy":"$_id","count":"$success.count","success":"$success.success"}}])