Github user marevol commented on the issue:
https://github.com/apache/incubator-predictionio/pull/336
@dszeto Could you replace ELASTICSEARCH1 with ELASTICSEARCH5?
https://github.com/apache/incubator-predictionio/blob/feature/es5/bin/pio-start-all#L37,L38
feature/es5 branch works on my es5 environment if the above is fixed.
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