Indicates whether this write result was acknowledged. If not, then all other members of this result will be undefined指示是否已确认此写入结果。如果不是，则此结果的所有其他成员都将未定义
The number of documents that matched the filter与筛选器匹配的文档数
The number of documents that were modified已修改的文档数
The number of documents that were upserted被打乱顺序的文档数
The identifier of the inserted document if an upsert took place如果发生追加销售，则插入文档的标识符
Generated using TypeDoc
TSchemais the schema of the collection是集合的架构