"enabing" security on an existing multinode cluster with multiple clients

I am trying to plan how to "enable security" on my cluster with the minimum of disruption to data collection. Most of the documentation focuses on how to do this when starting up a new installation (unsurprisingly). In my case I started before xpack was freely available...

I have been searching but the results are overwhelmed by all the new install stuff so if anyone know of anything specifically addressing existing cluster that would be great!

Clearly the cluster will be down for a while, first while I get TLS set up and then again when I enable user.

Any thoughts on how to shutdown the cluster in a way that minimises the time it takes to get its self back together when the nodes are restarted?

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