Github user pferrel commented on the issue:
https://github.com/apache/incubator-predictionio/pull/336
So you are using the old PIO plugins feature that basically puts any files
in `plugins` onto the SparkSubmit --files param? The plugins are, in effect,
jars outside the pio assembly to include when running a job?
This might work since we are not linking in classes from more than one
version of ES but how do you move a jar that isn't built, how do the jars get
built? Seems like some part of the build process has to change even if it's to
create these alternative jars?
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