[hotfix][doc] FlinkKafkaConsumer will be removed with Flink 1.17 instead of 1.15

[JingGe]

What is the purpose of the change

Back port #21172 to master: Change the docs: FlinkKafkaConsumer is deprecated and will be removed with Flink 1.17 instead of 1.15 since Flink 1.16 has code freeze and will be released soon.

Brief change log

• kafka.md
• zh kafka.md

Verifying this change

This change is a trivial doc update without any test coverage.

[flinkbot]

CI report:

• 1cca1af Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[zentol]

Let's just remove that entire line; why document something like that if we aren't committing to it.

[JingGe]

Removing the entire line is one option. Another option is that the content should be synced with older releases because nothing has been changed. We'd better let developers know that it will be removed soon, i.e. don't use it anymore.

After removing FlinkKafkaConsumer and (maybe) graduating some APIs(need discussion and voting), the content should be updated accordingly. Removing the entire line is one option but better would be pointing out that the FlinkKafkaConsumer has been removed with 1.17 to share the reference with customers, in case they are looking for FlinkKafkaConsumer and could not find it.

[JingGe]

@flinkbot run azure

[PatrickRen]

Thanks for the patch @JingGe . LGTM. We can remove this line once the community accepts the removal of the legacy Kafka source and sink.

[ngannt1710]

I use FlinkKafkaConsumer with two consumer and two partitions. But the two consumers receive the same message regardless of which partitions it is pushed to. Can you suggest me to help solve this problem?