Github user marevol commented on the issue:
https://github.com/apache/incubator-predictionio/pull/195
@jorelcb To support ES 5.x, we are working on PIO-49.
https://github.com/apache/incubator-predictionio/pull/195 will be closed.
For query tuning, I'll check it after
https://github.com/apache/incubator-predictionio/pull/358 is merged.
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