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 inserted documents for this operations为此操作插入的文档数
Map of the index of the inserted document to the id of the inserted document插入文档的索引到插入文档的id的映射
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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