db={"users":[{name:"jacob",_id:"5fc53209e70f776378cce0c5",history:[{_id:"5fc634bee65f96338a63b9e4",article:"5fc5f3e6140646c2024f7963",created_at:ISODate("2010-12-01T12:19:10.121+00:00")},{_id:"5fc634d8e65f96338a63b9e5",article:"5fc5faaa8b1fffc1f4dec900",created_at:ISODate("2010-12-01T12:19:36.102+00:00")}]}],"articles":[{_id:"5fc5faaa8b1fffc1f4dec900",title:"hello there",author:"5fc53209e70f776378cce0c5"},{_id:"5fc5f3e6140646c2024f7963",title:"hello wonderland",author:"5fc53209e70f776378cce0c5"}]}

db.users.aggregate([{$unwind:"$history"},{$lookup:{from:"articles",let:{articleId:"$history.article"},pipeline:[{$match:{$expr:{$eq:["$_id","$$articleId"]}},},{$lookup:{from:"users",localField:"author",foreignField:"_id",as:"author"}},{$unwind:"$author"},{$project:{_id:1,author:{_id:1,name:1},title:1}}],as:"history.article"}},{$unwind:"$history.article"},{$sort:{"history.created_at":-1}},{$group:{_id:"$_id",history:{$push:"$history"},name:{$first:"$name"}}}])