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。
The number of documents that were deleted已删除的文档数
Generated using TypeDoc
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。