How to upgrade druid cluster from 0.9 to 0.12 version

How to upgrade druid cluster from 0.9 to 0.12 version. As far as i know the doc which i found related to upgrade the druid cluster is following http://druid.io/docs/latest/operations/rolling-updates.html

but in this document i am not finding any steps to upgrade the cluster. any document related to upgrade the cluster will be very helpful.

Hey Mus,

That document you linked has the suggested server upgrade order.

Other than that I would suggest reading through the release notes for the intervening versions to make yourself aware of any special considerations for this jump.