Database
[{"finances":{"futurePostings":[{"description":"test","orderId":ObjectId("614702b9e98e83bc5d7d3d62")}],"balance":[]}}]
Query
db.collection.update({"finances.futurePostings.orderId":ObjectId("614702b9e98e83bc5d7d3d62"),},[{$set:{"finances.futurePostings":{$filter:{input:"$finances.futurePostings",cond:{$ne:["$$this.orderId",ObjectId("614702b9e98e83bc5d7d3d62")]}}},"finances.balance":{$concatArrays:["$finances.balance",{$filter:{input:"$finances.futurePostings",cond:{$eq:["$$this.orderId",ObjectId("614702b9e98e83bc5d7d3d62")]}}}]}}}])