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This PR implements KAFKA-20097 for KRaft mode.

When CreateTopics is invoked for a topic that already exists, the response
now includes the existing topicId instead of ZERO_UUID.

Changes:

  • Populate topicId for TOPIC_ALREADY_EXISTS in ReplicationControlManager
  • No functional changes in ControllerApis request validation
  • Updated ReplicationControlManagerTest to reflect new behavior

All relevant metadata and core tests pass.

@github-actions github-actions bot added triage PRs from the community core Kafka Broker kraft labels Feb 4, 2026
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A label of 'needs-attention' was automatically added to this PR in order to raise the
attention of the committers. Once this issue has been triaged, the triage label
should be removed to prevent this automation from happening again.

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