Field rename not working using processor.regex

[Pratik_Das_Baghel]

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@Pratik_Das_Baghel: Hi. I am using following telegraf configuration:

[[processors.regex]]
  order = 1
   [[processors.regex.field_rename]]
    pattern = "^(.*)_(.*?)_(\\w)"
    replacement = "${2}"
    result_key = "overwrite"

But i am getting following error:
Error running agent: Error loading config file telegraf.conf: plugin processors.regex: line 183: configuration specified the fields ["field_rename"], but they weren't used

What i am doing wrong here?

[Pratik_Das_Baghel]

Telegraf update worked.