Github user dszeto commented on the issue:
https://github.com/apache/incubator-predictionio/pull/352
So basically this will build PIO with the same behavior as before, and pack
the ES5 support as an extra JAR during `make-distribution.sh` in `lib/extra`.
In order to use ES5, one would remove the ES1 JAR in `lib/spark` and move the
ES5 JAR to `lib/spark`. There would be minimal change needed to
`conf/pio-env.sh` since their keys are shared. Correct @marevol? This
essentially does not require a separate build while allowing flexibility to use
a different backend support. @pferrel any more comments? I'll do a little more
testing and merge if this sounds good to you.
Thanks for the hard work @haginot and @marevol !
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