Github user pferrel commented on the pull request:
https://github.com/apache/incubator-predictionio/commit/d78b3cbe912cf57e2f0278e407a0d6432bd12849#commitcomment-21277683
This doesn't work with a pre-existing ES1 version of pio-env.sh. See the
Jira here https://issues.apache.org/jira/browse/PIO-49
No obvious reasons, this is a big PR.
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