Customize the time when the Graylog plan task occurred

Graylog every day at UTC 0:00 performed periodically Flushed and set the index to readonly, this timer task will consume large amounts of elasticsearch performance, lead to Graylog log write data backlog.

In my environment, graylog works well at any other time, except for this scheduled task execution time and the subsequent period of time.

But UTC 0:00 corresponding local time around the world will be a different time period, for example, in China, this time is just began to prepare work at 8:00 a.m. clock in the morning.

So I hope the new version of graylog will allow users to customize when this task will happen, or that by default it will be a good idea to schedule the task to happen at 0:00 local time.

Any help or pointers would be much appreciated.