KIP-487 — Automatic Topic Creation on Producer

Discussion ProducerClient

Proposes a `allow.auto.create.topics` configuration for the producer client that controls whether producing to a non-existent topic triggers an auto-creation metadata request. The current auto-topic-creation is triggered implicitly during metadata fetches, conflating metadata retrieval with topic creation—a side effect that is surprising, makes metadata requests non-idempotent, and bypasses AdminClient-based topic lifecycle management.

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