Some word should not be transmitted

Hi.
I have a question. I have a log with followings fileds:

User;Target;IP-Adress;PrivateCode
Name1;Server1;127.0.0.1;CD4523
Name2;Server21;127.0.0.2;CD4542
Name3;Server421;127.0.0.3;CD4556

Filebeat reading the log and transmitted all Lines to Elastic. That work fine.
But the problem was, the "PrivateCode" should not be transmitted for data protection reasons.
Who can I solve this?
perhaps with "exclude_line"?

Thank you very much.

Yup, exclude_lines could be an option: Filebeat : how to exclude lines - #2 by Shaoranlaos

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