Indicates whether this write result was acknowledged. 指示是否已确认此写入结果。If not, then all other members of this result will be undefined如果不是，则此结果的所有其他成员都将是未定义的
insertedCount
insertedCount:number
The number of inserted documents for this operations此操作的插入文档数
insertedIds
insertedIds:{}
Map of the index of the inserted document to the id of the inserted document插入文档索引到插入文档id的映射
Indicates whether this write result was acknowledged.指示是否已确认此写入结果。If not, then all other members of this result will be undefined如果不是，则此结果的所有其他成员都将是未定义的