[{_id:"62f695063cf6055e6a50fd6d",permissionGroupName:"User Management",permissionName:"Create User",__v:0},{_id:"62f695063cf6055e6a50fd6f",permissionGroupName:"User Management",permissionName:"Edit User",__v:0},{_id:"62f695063cf6055e6a50fd71",permissionGroupName:"User Management",permissionName:"Delete User",__v:0},{_id:"62f695073cf6055e6a50fd73",permissionGroupName:"User Management",permissionName:"Approve User",__v:0},{_id:"62f8a73c79a839650a183182",permissionGroupName:"Country Management",permissionName:"Approve Country",__v:0},{_id:"62f8ad3c79a839650a113184",permissionGroupName:"Country Management",permissionName:"Delete Country",__v:0},]

db.collection.aggregate([{"$group":{"_id":"$permissionGroupName","permissions":{"$push":"$permissionName"}}},{"$project":{"permissionGroupName":"$_id","permissions":1,"_id":0}}])