Database
[{"_id":ObjectId("5cb8218ce2911e7c707e27fa"),"name":"name 1","members":{"user_1":{"created":ISODate("2019-04-18T07:04:44.748Z"),"lastActive":1555584757282,"state":1,"unreadMessages":0,"userId":"user_1_id"},"user_2":{"lastActive":1555588409686,"state":1,"unreadMessages":0,"userId":"user_2_id"}}}]
Query
db.collection.find({},{"members.user_1.lastActive":1,"members.user_2.lastActive":1,"name":1})