Github user marevol commented on the issue:
https://github.com/apache/incubator-predictionio/pull/336
Right. To use ES5, please replace pio-data-elasticsearch1-assembly-\*.jar
with pio-data-elasticsearch-assembly-\*.jar in lib/spark directory.
To change JARs location(ex. lib/spark), we can modify JAR lookup handing in
compute-classpath.sh and Common.scala for #352.
> The default for 0.11 is ES1, with a param for ES5.
ES 1.x was EOLed.
https://www.elastic.co/jp/support/eol
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