Database
[{sensor:{bearing_accelerometer_sensor:ObjectId("618e3fc8fccb88b50f2d9317"),other_key:123}}]
Query
db.collection.aggregate([{$set:{sensor:{$filter:{input:{$objectToArray:"$sensor"},cond:{$ne:["$$this.v",ObjectId("618e3fc8fccb88b50f2d9317")]}}}}},{$set:{sensor:{$arrayToObject:"$sensor"}}}])