KIP-1039 — Disable automatic topic creation for MirrorMaker2 consumers

Discussion MirrorMakerConsumer

Changes the default value of allow.auto.create.topics to false for MirrorMaker2 internal consumers, preventing deleted source topics from being silently auto-recreated on the source cluster when MM2 consumers poll them. When a topic is deleted on the source cluster and MM2 consumers (which still hold metadata for it) poll, auto-topic-creation recreates the topic as an empty, un-configured replica, causing ambiguity and data inconsistency.

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