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https://issues.apache.org/jira/browse/FLINK-17623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17110770#comment-17110770
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Yangze Guo commented on FLINK-17623:
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Sorry for the belated response. In this case, I would choose exposing a close
method since there is "open" method in it. Not sure who is the owner of ES
connector. Just try to ping [~tzulitai] according to the commit history.
> Elasticsearch sink should support user resource cleanup
> -------------------------------------------------------
>
> Key: FLINK-17623
> URL: https://issues.apache.org/jira/browse/FLINK-17623
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / ElasticSearch
> Reporter: Yun Wang
> Priority: Major
> Labels: usability
>
> There should be a way for an
> [ElasticsearchSinkFunction|[https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/ElasticsearchSinkFunction.java]]
> implementation to use resources with the same lifecycle as the Elasticsearch
> sink, for example, an
> [RestHighLevelClient|[https://www.elastic.co/guide/en/elasticsearch/client/java-rest/master/java-rest-high.html]].
> Currently there is no way to clean up such resources.
> This can be achieved by either of the below:
> # Expose a `close()` method in the ElasticsearchSinkFunction interface, and
> invoke the close method from [ElasticsearchSinkBase.close
> |[https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/ElasticsearchSinkBase.java|https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/ElasticsearchSinkBase.java#L331]].
> # Make the
> [ElasticsearchSink|[https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-elasticsearch6/src/main/java/org/apache/flink/streaming/connectors/elasticsearch6/ElasticsearchSink.java]]
> class extendable.
>
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