[{_id:{genre:"suspense"},price:10210.6,data:[{subGenre:"Thriller",flag:false},{subGenre:"jumpScare",flag:true},{subGenre:"horror",flag:false}]}]

db.collection.aggregate([{"$project":{"_id":0,"price":1,"data":{"$getField":{"field":"subGenre","input":{"$first":{"$filter":{"input":"$data","cond":"$$this.flag"}}}}}}}])