[FLINK-20979] [elasticsearch] Corrected Elasticsearch Documentation for sink.bulk-flush.max-actions

[rionmonster]

What is the purpose of the change

This pull request corrects an error within the documentation for the Elasticsearch connector for the sink.bulk-flush.max-actions option that could potentially cause users to use an invalid value '0' as opposed to the correct value '-1' when attempting to disable this feature.

Brief change log

Minor documentation change that should align the documentation with its functionality.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

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Automated Checks

Last check on commit 9fe82ea (Wed Mar 10 03:24:15 UTC 2021)

Warnings:

• This pull request references an unassigned Jira ticket. According to the code contribution guide, tickets need to be assigned before starting with the implementation work.

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CI report:

• 9fe82ea Azure: SUCCESS

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[wuchong]

The documentation might be correct. Let's discuss it in JIRA first.

[MartijnVisser]

Connector has been moved to https://github.com/apache/flink-connector-elasticsearch