Given:
I have an existing event-process-instance index in Optimize 3.0.0
and existing reports on the process

When:
I upgrade to Optimize 3.1.0 and look into the reports

Then:
There are no instances

Expected:
The instances should be there

Hint:
The cause is that the `process-instance` index was missed to be applied as read only index to the specific event-process-instance index after migration.