Database
[{_id:"003fjasf0234j03j0349",FirstLayer:{SecondLayer:{Status:{9428f:{active:"Active"}}}}},{_id:"qg3o4034034nr34343",FirstLayer:{SecondLayer:{Status:{9428f:{active:"Active"}}}}},{_id:"293je2odjojwe0f23",FirstLayer:{SecondLayer:{Status:{00fekw:{active:"Not Active"}}}}}]
Query
db.collection.aggregate([{$set:{Status:{$objectToArray:"$FirstLayer.SecondLayer.Status"}}},{$match:{"Status.v.active":"Active"}},{$unset:"Status"},{$sample:{size:50}}])