Graylog notification showing index ranges recalculation required

I have got a working graylog cluster with 1 master and 3 slaves.
The web interface shows an error in the notification :

Index ranges recalculation required
The index ranges are out of sync. Please go to System/Indices and trigger a index range recalculation from the Maintenance menu of the following index sets: Default index set

What does this means and how should I solve it ?

Have you tried simply doing what the notification said?

Please refer to for some background information.

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