alpreu opened a new pull request #19085:
URL: https://github.com/apache/flink/pull/19085
## What is the purpose of the change
In 1.15 we ported the Elasticsearch sink to the new unified Sink interface.
We initially did not port over the `ActionFailureHandler` as we wanted to
deprecate it. When release-testing the Sink we found out that users depend on
having the customizable FailureHandler so we want to re-introduce it to the
sink.
## Brief change log
- Added ActionFailureHandler back, adding the failed requests in the
ElasticsearchWriter
- Wrote a unit test that simulates the logic from the
`Elasticsearch7Example` E2E Test.
- Updated the docs
## Verifying this change
This change can be tested with the newly introduced unit test, as well as
the old E2E test.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (**yes** / no)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't
know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (**yes** / no)
- If yes, how is the feature documented? (not applicable / **docs** /
JavaDocs / not documented)
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