Database
[{"id":"sdfsdfsdf","key":"tryrtyrty","createdAt":"2017-01-28T01:22:14.398Z","counts":[170],"value":"Something"},{"id":"hjmhjhjm","key":"yuiyuiyui","createdAt":"2017-01-28T01:22:14.398Z","counts":[150,160],"value":"Something"}]
Query
db.collection.aggregate([{$set:{"totalCounts":{$sum:"$counts"}}},{$match:{totalCounts:{$gte:200,$lte:400}}},{$unset:["counts","id"]}])