fuzziness AUTO参数疑问

官网解释：Generates an edit distance based on the length of the term. Low and high distance arguments may be optionally provided AUTO:[low],[high]. If not specified, the default values are 3 and 6, equivalent to AUTO:3,6 that make for lengths:

0..2
Must match exactly
3..5
One edit allowed
>5
Two edits allowed
但是，我配置{"value":"jenno_o","fuzziness":"AUTO:4,7"}为什么能匹配出
      {
        ......
        "_source" : {
          "name" : "JennH2o",
        }
      }
按理7个字符，设置允许编辑距离是1, 但是结果看起来编辑距离是2。且我设置AUTO:4,8就符合预期，难道最后是闭区间官方文档写错了？
来个人打醒下我！