I am trying to upgrade a Sitecore environment for one of our customers from 9.0.2
to 9.1.1
.
For this, I have set up a parallel upgraded environment. Now we will soon be switching the servers.
One issue that comes up is that if any user is registered in the gap ( i.e. the time take to upgrade the environment..around 2-3 days) and the analytics data captured will be lost.
How do I migrate this data?