Default encoding for filebeat

Dear All

I'm trying to find the default encoding when we don't set anything specific in prospector. I was referring to the documentation "https://www.elastic.co/guide/en/beats/filebeat/6.8/filebeat-input-log.html", but could not find a reference of what is default.

The files we create are UTF8NoBOM. I do see them classfied as UTF8 when I open in a text editor like notepad, and also observed filebeat reads them to our redis target. But had faced a issue today when some formatted contents were written to the file.

Queries

  1. What is default encoding the filebeat reads a file
  2. "The "plain" -- does not validate or transform any input " - How the special charters or any specific character encoded values are treated?

Thanks for clarification.

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