mongodb聚合结果超出了最大文档大小

Question

我正在尝试检索一个＆＃34; unwinded＆＃34;我的文档版本，但结果超出了允许的最大大小。 这是我正在进行的聚合：

var result = collection.Aggregate(
            new BsonDocument {{"$unwind", "$Surgeries"}},
            new BsonDocument {{"$unwind", "$Surgeries.Procedures"}},
            new BsonDocument {{"$unwind", "$Surgeries.Procedures.ScannedItems"}},
            new BsonDocument
                {
                    {
                        "$project", new BsonDocument
                            {
                                {"_id", 0},
                                {"PatientAgeId", 1},
                                {"PatientAge", 1},
                                {"PatientBMIId", 1},
                                {"PatientASAId", 1},
                                {"PatientASA", 1},
                                {"PatientBMI", 1},
                                {"ClientId", "$Surgeries.Procedures.ClientId"},
                                {"PhysicianId", "$Surgeries.Procedures.PhysicianId"},
                                {"ProcedureTypeName", "$Surgeries.Procedures.ProcedureTypeName"},
                                {"Item_CategoryName", "$Surgeries.Procedures.ScannedItems.CategoryName"},
                                {"Item_ManufacturerName", "$Surgeries.Procedures.ManufacturerName"},
                                {"Item_ItemClassName", "$Surgeries.Procedures.ScannedItems.ItemClassName"},
                                {"Item_ItemGroupName", "$Surgeries.Procedures.ScannedItems.ItemGroupName"},
                                {"Item_PriceTypeId", "$Surgeries.Procedures.ScannedItems.PriceTypeId"},
                                {"Item_Cost", "$Surgeries.Procedures.ScannedItems.ActualCost"}
                            }
                    }
                });

是否可以使用GridFS来实现这一目标？

我已经读过可以使用$ skip运算符并使用多个聚合循环遍历集合并合并结果。这会如何影响性能？这是一个好习惯吗？