Database
[{"_id":ObjectId("62622dd73905f04f59db2971"),"array1":{0:{"_id":"12","array2":[{0:{"_id":"123","answeredBy":[]}},{1:{"_id":"124","answeredBy":[]}}]}}},{"_id":ObjectId("626230e03905f04f59db29f5"),"array1":{0:{"_id":"22","array2":[{0:{"_id":"223","answeredBy":[]}},{1:{"_id":"220","answeredBy":[]}}]}}}]
Query
db.collection.find({$expr:{$gt:["$array1.0.array2.0._id","$array1.0.array2.1._id"]}})