我正在尝试查看MongoDB更改流中特定字段status的更新。来自ChangeEventdocumentation页面，更改流将输出此文档:{_id:{},"operationType":"","fullDocument":{},"ns":{"db":"","coll":"},"updateDescription":{"updatedFields":{},"removedFields":["",...]}}我总是获取所有字段，但将updateDescription.updatedFields设为null。这是我正在使用的Java代码MongoClientmongoClient=new