Github user marevol commented on the issue:
https://github.com/apache/incubator-predictionio/pull/336
To solve this issue, how about using plugin directory?
In our branch(https://github.com/jpioug/incubator-predictionio), ES1/ES5
codes in data were extracted to data-elasticsearch and data-elasticsearch1
project. Putting the jar file into plugin directory, it works.
So, default PIO distribution contains pio-data-elasticsearch5.jar in
plugins directory,
and then if you want to use ES1, replacing it with
pio-data-elasticsearch1.jar, PIO works with ES1.
I think that Plugin mechanism can keep previous behavior for ES1.
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