Github user EmergentOrder commented on the issue:
https://github.com/apache/predictionio/pull/466
Actually, according to the docs, existing indices, and so apps, should
continue to work in 6.X (but will be disallowed in 7.X). I assume there is a
documented ES migration process. There may be exceptions in template code, such
as in the UR where the urindex is hot-swapped. I haven't tested this, but I
will.
Assuming that existing apps keep working, and on (re)creation they work,
from the user's perspective I don't see a disruption / need for a PIO migration
tool. This obviously doesn't hold for when we get to ES 7 though.
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