What is the best practice to pseudonymize user data with elastic?

[geheim01]

What is the recommended approach to deal with logs to be as GDPR compliant as possible?
I need to pseudonymize user data. The only resource I found is dated back to march of 2018 in this blog post: https://www.elastic.co/de/blog/gdpr-personal-data-pseudonymization-part-1

Is this still best practice? Can I use the fingerprint method within a beat instead of logstash, because I'm not using logstash right now and try to keep my stack as slim as possible.