Upgrading Virtual Machines Enterprise 6.5.4 to 7.1.2: preserving data, including indexes?

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Splunk Enterprise 6.5.4
Clustered environment
3 Search heads
3 Indexers
1 Heavy Forwarder (with DB Connect)
1 License Manager (wouldn't this be the Cluster Master?)
1 Distribution Server

These are Virtual Machines on VMWare. I Want to upgrade to 7.1.2. I have been told that the data (including indexes) is not changed for an upgrade with these versions involved. So if I snapshot the Splunk VM's can't I just restore the machines from snapshots as my backout procedure should I run into any problems?
Thanks for any info anyone has on this.

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