[{"_id":ObjectId("5a934e000102030405000000"),"username":"John","email":"johnkhopert@gmail.com","password":"#345%rtk","date":"2020-02-19","isVerified":false,"hub":{"hubID":"3456","isSetup":true,"monitoring":{"x_prop":1,"y_prop":2,"z_prop":3}}},{"_id":ObjectId("5a934e000102030405000001"),"username":"Emily","email":"emilytoledo@gmail.com","password":"awesomepassword","date":"2020-06-19","isVerified":false,"hub":{"hubID":"3457","isSetup":true,"monitoring":{}}},{"_id":ObjectId("5a934e000102030405000002"),"username":"PeterEngland","email":"pengland@gmail.com","password":"donthavepassword","date":"2020-07-19","isVerified":false,"hub":{"hubID":"3458","isSetup":false,"monitoring":{"x_prop":"alpha","y_prop":"beta","z_prop":"gamma"}}}]

db.collection.aggregate([{$match:{"_id":ObjectId("5a934e000102030405000002")}},{"$project":{"monitoring":"$hub.monitoring","_id":0}}])