[{"_id":"6287443338ed135a9e0b1b9d","data":[{"pChange":0,"strikePrice":34000},{"pChange":0,"strikePrice":35000},]}]

db.collection.aggregate({$unwind:"$data"},{$match:{"data.strikePrice":34000}},{$group:{_id:"$_id",data:{$push:"$data"}}})