Indicates whether this write result was acknowledged. 指示此写入结果是否已确认。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
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Indicates whether this write result was acknowledged.指示此写入结果是否已确认。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。