[{_id:ObjectId("60617172eca858909eace71f"),marketId:"1.278363651",eventId:5697224,marketType:"OVER_UNDER_15",size:30000,updates:[{t:1616998770482.0,p:36.49},{t:1616998770482,p:87.77},]},{_id:ObjectId("60617172eca858909eace71d"),marketId:"1.278363651",eventId:5697224,marketType:"OVER_UNDER_15",size:30000,updates:[{t:1616998770480.0,p:36.40},{t:1616998770483,p:87.77},]}]

db.collection.aggregate([{$match:{marketId:"1.278363651"}},{$project:{_id:0,updates:1}},{$unwind:"$updates"},{$replaceRoot:{newRoot:"$updates"}}])