Database
[{userId:"1",products:[{productId:"1",createdAt:"2023-07-02"},{productId:"2",createdAt:"2023-07-01"},{productId:"3",createdAt:"2023-07-03"},]}]
Query
db.collection.aggregate([{$set:{products:{$sortArray:{input:"$products",sortBy:{createdAt:1}}}}},])