如何在C# Mongo驱动中使用$facet进行以下查询？

var client = new MongoClient("mongodb://localhost:27017");

var database = client.GetDatabase("your_database_name");
var collection = database.GetCollection<BsonDocument>("your_collection_name");

var matchStage = new BsonDocument("$match", new BsonDocument("your_field", "your_value"));
var facetStage = new BsonDocument("$facet", new BsonDocument
{
    { "facet1", new BsonArray
        {
            new BsonDocument("$sortByCount", "$field1"),
            new BsonDocument("$limit", 10)
        }
    },
    { "facet2", new BsonArray
        {
            new BsonDocument("$sortByCount", "$field2"),
            new BsonDocument("$limit", 10)
        }
    }
});

var pipeline = new[] { matchStage, facetStage };

var result = collection.Aggregate<BsonDocument>(pipeline).ToList();