[{id:1,email:"hi@hi.hi"},{id:1,title:"title"},]

db.collection.aggregate([{$group:{_id:"$id","id":{"$addToSet":"$id"},"email":{$addToSet:"$email"},"title":{$addToSet:"$title"}}},{$project:{_id:1,id:{"$arrayElemAt":["$id",0]},email:{"$arrayElemAt":["$email",0]},title:{"$arrayElemAt":["$title",0]},}}])