Ability to modify default search fields

As instructed here: https://community.graylog.org/t/specifying-default-fields/4118
I'd like to ask for a new feature.

When I open graylog->search there is some default selection (applicable by clicking default button)
I'd like to change which checked fields are the default.

## Expected Behavior

When I change default search fields in configuration, the default search fields be different and when I click default button in the search fields, it will recreate the new default fields when changed.

## Current Behavior

Currently there is no option to change default fields as a new default.

## Context

We are logging process name and loglevel, because we are logging from 3 processes on each machine. And we want to have default distinction for all logs between these fields.