[{"_id":{"import_type":"MANUAL_UPLOAD","supplier":"jabino.de","unit_price":"0"},"statuses":[{"status":"DUPLICATED","count":14},{"status":"BLACKLISTED","count":2},{"status":"USABLE","count":2239},{"status":"INVALID_EMAIL_ADDRESS","count":1},{"status":"DUPLICATED","count":14},{"status":"BLACKLISTED","count":2},{"status":"USABLE","count":2239},{"status":"INVALID_EMAIL_ADDRESS","count":1}]}]

db.collection.aggregate([{$unwind:"$statuses"},{$group:{_id:{_id:"$_id",statuses:"$statuses.status"},count:{$sum:"$statuses.count"}}},{$group:{_id:"$_id._id",statuses:{$push:{status:"$_id.statuses",count:"$count"}}}}])