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The existing `consumer.override.*` mechanism in Kafka Connect (governed by `connector.client.config.override.policy`) is reused. No new override mechanism is introduced.

Note: Share groups use a different state topic (__share_group_state), but looks like __consumer_offsets will be used for memebership, so if we do not delete the group before switching it can cause problem.

So user should make sure share group id is not equal to consumer group id at anytime. We can have a check/validation while implementing it. 

4. Compatibility, Deprecation, and Migration Plan

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