Github user marevol commented on the issue:
https://github.com/apache/incubator-predictionio/pull/336
To use the existing code for elasticsearch 1.x, please use
PIO_STORAGE_REPOSITORIES_METADATA_SOURCE=ELASTICSEARCH1 and
PIO_STORAGE_SOURCES_ELASTICSEARCH1_* settings.
> The UR uses the REST API for 1.x and can easily switch to 5.X so I'd like
to coordinate.
o.a.p.data.strorage.elasticsearch.* classes contain index mappings and it's
different between 1.x and 5.x.
So, to use new code for 5.x in 1.x, the mapping needs to be modified.
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