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[jira] [Created] (CALCITE-2376) migrate elastic adapters to (low-level) rest client


Andrei Sereda created CALCITE-2376:
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             Summary: migrate elastic adapters 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: Julian Hyde


This is an effort to migrate existing Elastic Search adapters to use [low-level rest client|https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/java-rest-low.html]. Existing [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. 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 are expected. 
  



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