[FLINK-21511][es] Bump Elasticsearch6 version to 6.8.12

[zhangmeng0426]

What is the purpose of the change

(For example: This pull request makes task deployment go through the blob server, rather than through RPC. That way we avoid re-transferring them on each deployment (during recovery).)

on Elasticsearch 6.3.1 there is a bug BulkProcessor hangs for threads deadlocked

description bug : elastic/elasticsearch#44556

fix bug : elastic/elasticsearch#47599

upgrate Elasticsearch version to 6.8.12

Brief change log

(for example:)

• The TaskInfo is stored in the blob store on job creation time as a persistent artifact
• Deployments RPC transmits only the blob storage reference
• TaskManagers retrieve the TaskInfo from the blob cache
  upgrate Elasticsearch version to 6.8.12

Verifying this change

(Please pick either of the following options)

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

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (100MB)
• Extended integration test for recovery after master (JobManager) failure
• Added test that validates that TaskInfo is transferred only once across recoveries
• Manually verified the change by running a 4 node cluser with 2 JobManagers and 4 TaskManagers, a stateful streaming program, and killing one JobManager and two TaskManagers during the execution, verifying that recovery happens correctly.

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

• Dependencies (does it add or upgrade a dependency): (yes)
• 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 / docs / JavaDocs / not documented)

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Last check on commit f5dc7ee (Fri May 28 11:06:54 UTC 2021)

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[KarmaGYZ]

@zhangmeng0426 The commit message could be changed to "[FLINK-21511][es] Bump Elasticsearch6 version to 6.8.12". You can try to rerun the CI.

[KarmaGYZ]

Hi, @zhangmeng0426 . Thanks for the contribution.
We need also to change the version in other places:

• ElasticsearchSinkITCase
• run-nightly-tests.sh
• NOTICE files
• Elasticsearch6DynamicSinkITCase

Also, the commit message should be changed.

[KarmaGYZ]

@zhangmeng0426 Do you still work on it?

[fapaul]

As part of https://issues.apache.org/jira/browse/FLINK-24323, we upgraded the elastic search versions. I'll close this ticket.