[{"user":"aa@hotmail.com","AddressLine":"jntgt","vat":"gfgf","Companyname":"gfgfg","countryName":"mexico","AddressTitle":"ev",},{"user":"aa@hotmail.com","AddressLine":"gthh","vat":"gfgf","Companyname":"gfgfg","countryName":"usa","AddressTitle":"ev",},{"user":"bb@hotmail.com","AddressLine":"gdgg","vat":"gfgf","Companyname":"ljjjhg","countryName":"Angola","AddressTitle":"ev",}]

db.collection.aggregate([{$group:{_id:"$user",addresses:{$push:"$$ROOT"}},},{$project:{user:"$_id",addresses:1,}},{$project:{_id:0,"addresses.user":0}}])