Filebeat hostname lowercase uppercase

I find out that filebeat sometimes writes hostname in lowercase letters.
I don't know why.
Thank you in advance

Could you elaborate on this? Which hostname are you referring to? Maybe some examples will help.



For example, actual hostname is 'TTS29' but filebeat wrote 'tts29'

Where is this hostname showing up? And where are you seeing the lowercase version? Could you share your filebeat.yml and the complete, exact filebeat command you ran?

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