I got the task to configure graylog to keep log files for 6 months.
At the moment, the index rotation type is by size with a special number of logs to keep.
I want to change to every 12 hours and keep 365 indices. (365*12=4380=6 Months)
What happens if I change the rotation? Does graylog recalculate all older indices? Are they affected from keeping only 6 Months?