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https://issues.apache.org/jira/browse/CALCITE-2376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16540917#comment-16540917
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Andrei Sereda commented on CALCITE-2376:
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[~julianhyde] [PR 758|https://github.com/apache/calcite/pull/758] 

> Unify ES2 and ES2 adapters. Migrate to low-level rest client
> ------------------------------------------------------------
>
>                 Key: CALCITE-2376
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2376
>             Project: Calcite
>          Issue Type: Improvement
>          Components: elasticsearch-adapter
>            Reporter: Andrei Sereda
>            Assignee: Michael Mior
>            Priority: Major
>             Fix For: 1.17.0
>
>
> This is an effort to migrate Elastic Search adapters to use [low-level rest 
> client|https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-low.html].
>  Current [native transport 
> client|https://www.elastic.co/guide/en/elasticsearch/client/java-api/6.3/client.html]
>  has been deprecated in 7.0 (to be removed in 8.x).
> Another advantage of low-level client is that it is compatible with any ES 
> server version and has few (non-core) dependencies. As part of this 
> improvement, both ES2 and ES5 adapters will be unified and reside under new 
> maven module {{elasticsearch}} (contrary to separate {{elasticsearch2}} and 
> {{elasticsearch5}}).
> h3. Breaking changes
> Using new {{artifactId}} and {{SchemaFactory}} implementation will force 
> clients to change their configuration and dependencies. No other breaking 
> changes (except configuration) are expected. 
>   



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