How to update log msg with FileBeat

I am new to FileBeat and I checked the document, yet seems can't find a way to update the log message from input log file to output log file.
It seems to be I should be using one of the processors yet I tried some and still can't get it working. Is that possible someone can point me to the correct direction e.g. which processors that I should use, please?

I am hoping to update the log message from "begin of log file keyword to update end of log file" to "begin of log file UPDATED KEYWORD end of log file".

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