[jira] [Created] (FLINK-16495) Improve default flush strategy for Elasticsearch sink to make it work out-of-box

["Jark Wu (Jira)" <ji...@apache.org>]

Jark Wu created FLINK-16495:
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             Summary: Improve default flush strategy for Elasticsearch sink to make it work out-of-box
                 Key: FLINK-16495
                 URL: https://issues.apache.org/jira/browse/FLINK-16495
             Project: Flink
          Issue Type: Improvement
          Components: Connectors / ElasticSearch, Table SQL / Ecosystem
            Reporter: Jark Wu
             Fix For: 1.11.0


Currently, Elasticsearch sink provides 3 flush options: 

{code:java}
'connector.bulk-flush.max-actions' = '42'
'connector.bulk-flush.max-size' = '42 mb'
'connector.bulk-flush.interval' = '60000'
{code}

All of them are optional and have no default value in Flink side [1]. But flush actions and flush size have a default value {{1000}} and {{5mb}} in Elasticsearch client [2]. This results in some surprising behavior that no results are outputed by default, see user report [3]. Because it has to wait for 1000 records however there is no so many records in the testing. 

This will also be a potential "problem" in production. Because if it's a low throughout job, soem data may take a very long time to be visible in the elasticsearch. 

In this issue, I propose to have Flink's default values for these 3 options. 

{code:java}
'connector.bulk-flush.max-actions' = '1000'   -- same to the ES client default value
'connector.bulk-flush.max-size' = '5mb'  -- same to the ES client default value
'connector.bulk-flush.interval' = '5s'  -- avoid no output result
{code}


[1]: https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/ElasticsearchSinkBase.java#L357-L356
[2]: https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-docs-bulk-processor.html
[3]: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Should-I-use-a-Sink-or-Connector-Or-Both-td33352.html



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