Although $replaceWith is a valid operator for the aggregation pipeline, it is currently not implemented in Mongomock

[Mlkhall]

Doesn't work for this query:

[{'$match': {'order_number': {'$in': ('R107675064',
                                      'R182251261',
                                      'R260757148',
                                      'R330051387',
                                      'R480463364')}}},
 {'$sort': {'order_number': 1, 'created_at_afs': -1}},
 {'$group': {'_id': '$order_number',
             'most_recent_record': {'$first': '$$ROOT'}}},
 {'$replaceWith': '$most_recent_record'},
 {'$project': {'_id': 0, 'order_number': 1, 'shipments': 1}}]

[timok19]

Is there any updates? Is it still alive? I am getting almost the same error, but for pipeline lookup operator