Is it possible to rename _id field after mongo's group aggregation?

Question

I have a query like this (simplified):

db.report.aggregate([{
        $match: {
            main_id: ObjectId(\"58f0f67f50c6af16709fd2c7\")
        }
    },          


        

Answer 1

 db.report.aggregate(   
{     
$group: {_id: '$name'} 
},
{
$project:{
  name:"$_id",
 _id:false} }
 )