Upgrade steps in short:
These steps are for 1 SH, 1 CM, 1 FWD, 4 IDX
1) set CM in maintenance mode
2) bring down all the peers
3) bring down the master
4) upgrade everybody - don't start! (untar over existing /splunk directory)
5) start master
6) set master in maintenance mode
7) start peers
8) start search-head
9) check things (searchability from SH, show cluster-bundle-status from CM)
10) if all is well, unset maintenance mode, then start the fwd
11) test fwd / inputs
12) pantaloons
13) doubloons
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