rinkako created FLINK-18359:
-------------------------------

             Summary: Improve error-log strategy for Elasticsearch sink for 
large data documentId conflict when using create mode for `insert ignore` 
semantics
                 Key: FLINK-18359
                 URL: https://issues.apache.org/jira/browse/FLINK-18359
             Project: Flink
          Issue Type: Improvement
            Reporter: rinkako


The story is: when a flink job for ingesting large number of records from data 
source, processing and indexing to ES with Elasticsearch sink fault, we may 
restart it from a specific data set which contains lots of data which already 
sink into ES.

At this case, a `INSERT IGNORE` semantics is necessary, and we use `public 
IndexRequest create(boolean create)` with `true` args and ignore the 409 
restStatusCode at a customized ActionRequestFailureHandler to make it work.

But, the `BulkProcessorListener` always log a error event before it calls the 
`failureHandler` in its `afterBulk` method, and will produce tons of error log 
for document id conflict, which we already know and handle them in customized 
ActionRequestFailureHandler.

Therefore, it seems that the error log action at the 
ActionRequestFailureHandler (either the default IgnoringFailureHandler or a 
custom handler) is more flexible ?

 



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