Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{id:"1",name:"sample",user:[{data_alias:"ex",value:"efg"}]}]
Query
db.collection.find({"id":"1"},{_id:0,"name":1,"data":{$arrayElemAt:["$user.data_alias",0]}})
Result