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https://issues.apache.org/jira/browse/NIFI-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15351695#comment-15351695
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ASF GitHub Bot commented on NIFI-2068:
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Github user JPercivall commented on the issue:

    https://github.com/apache/nifi/pull/576
  
    There have already been comments asking for a multi-get function for 
ElasticSearch[1] could this be added to FetchElasticSearchHTTP now and be added 
as a new feature to PutElasticSearch later (Create a Jira for it)?
    
    [1] 
https://community.hortonworks.com/questions/41951/how-to-get-all-values-with-expression-language-in.html


> Add Elasticsearch processors that use the REST API
> --------------------------------------------------
>
>                 Key: NIFI-2068
>                 URL: https://issues.apache.org/jira/browse/NIFI-2068
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Matt Burgess
>            Assignee: Matt Burgess
>             Fix For: 1.0.0
>
>
> The current Elasticsearch processors use the Transport Client, and as a 
> result there can be some compatibility issues between multiple versions of ES 
> clusters. The REST API is much more standard between versions, so it would be 
> nice to have ES processors that use the REST API, to enable things like 
> migration from an Elasticsearch cluster with an older version to a cluster 
> with a newer version.



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