[{"ID":"290283667","Data":{"Product-2713890":{"Created":ISODate("2016-08-23T20:55:39.437Z"),"Product":"Product-2713890"},"Product-6943532":{"Created":ISODate("2017-07-23T20:55:39.437Z"),"Product":"Product-6943532"}}},{"ID":"290283668","Data":{"Product-2713895":{"Created":ISODate("2018-01-23T20:55:39.437Z"),"Product":"Product-2713895"}}}]

db.collection.aggregate([{$addFields:{productsMap:{$objectToArray:"$$ROOT.Data"}}},{$project:{"Products":{$map:{input:"$productsMap",as:"p",in:{Product:"$$p.k",Created:{$dateToString:{format:"%Y-%m-%d %H:%M:%S",date:"$$p.v.Created"}},ID:"$ID",_id:"$_id"}}},_id:0}}])