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https://issues.apache.org/jira/browse/PIO-33?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15836982#comment-15836982
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Pat Ferrel commented on PIO-33:
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This should be resolved, Elasticsearch 5.x does work with dot in property names
and is so we may wish to skip 2.x
> Add support for Elasticsearch 2.x to upgrade release branch
> -----------------------------------------------------------
>
> Key: PIO-33
> URL: https://issues.apache.org/jira/browse/PIO-33
> Project: PredictionIO
> Issue Type: New Feature
> Affects Versions: future release
> Reporter: Pat Ferrel
> Assignee: Pat Ferrel
> Fix For: future release
>
>
> We have code that does this but the remaining issure is that ES encodes data
> differently than 1.x and so teh current form of engine.json `sparkConf` does
> not work. This can be removed as a feature afaik since all of thos params can
> be passed on the command line. Also we could escape illegal characters in the
> engine.json and unescape before passing them to Spark.
> This will be binary incompatible with ES 1.x so adding to the upgrade branch
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