$addField query does not work as expected

Question

I am running this query to add new field in my document, and it run successfully but does not update the document in mongodb.(movies is the collection name, mongodb version - 4.2.15 Community)

db.movies.aggregate([{
 $addFields: {
   totalHomework: "123312" ,
   totalQuiz: "12312"
 }}])

Answer 1

update

db.collection.update({},
{
  $set: {
    totalHomework: "123312",
    totalQuiz: "12312"
  }
})

mongoplayground