Implementing security on a live production stack

I'm in the process of upgrading a (very) old stack. Now at version 6.8.12, I want to implement security.

The issue is : it's a live, production system. It's ingesting 2.6K e/s and altough I have a little bit of spooling (through redis), it is not unlimited. It is also not-minimal, with 6 data nodes and 2 ingest/display nodes.

How can I enable inter-node encryption and TLS security with minimal downtime and without losing any event data ?

(note : I have read the documentation at and others and I think I have a pretty good understanding of the process - but most examples are for either small or idle clusters where mine is neither small nor idle)

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