[Bug]: Extra fields in Filebeat inputs not working

[widhalmt]

Please try to fill out as much of the information below as you can. Thank you!

• Yes, I've searched similar issues on GitHub and didn't find any.

Which version contains the bug?

No response

Describe the bug

When using die fields setting in filebeat_log_inputs you don't get the whole line in fields within filebeat.yml. Only the field name but not the value.

Thanks, @tbumke for reporting this bug.

How to recreate the bug?

Use variables like this:

filebeat_log_inputs:
  messages:
    name: messages
    paths:
      - /var/log/messages
    fields:
      index_suffix: system

The value system will not be written to filebeat.yml.

[widhalmt]

I just saw, that the variable still uses the old naming scheme. I will test this with the new one and come back with the results.