I am planning out the first upgrade of Splunk Enterprise Security (Splunk ES) and am working out how. When we installed the system with Professional Services, we had a test server and our production search head pointing at the same index layer. These were both the same version of ES and allowed us to test some configs. Now that I am working on a major version upgrade (3.3.1 to 4.1.4 to 4.7.1), will it break things having a test server upgraded to 4.1.4 if the 3.3.1 search head is still up? Or is the better strategy now to snapshot the Prod server and upgrade there?
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