Database
[{"positions":[{branch:ObjectId("60691ada4a9943d8eb562874"),area:ObjectId("60691aea4a9943d8eb562875")},{branch:ObjectId("60691ada4a9943d8eb562875"),area:ObjectId("60691aea4a9943d8eb562876")}]}]
Query
db.collection.find({positions:{$elemMatch:{branch:ObjectId("60691ada4a9943d8eb562874"),area:ObjectId("60691aea4a9943d8eb562875")}}})