Will a Consumer Group Without Active Consumers Be Automatically Deleted in 14 Days?

Yes.

Kafka uses the offsets.retention.minutes parameter to control how long to keep offsets for a consumer group. If offsets are not committed within this period, they will be deleted. The default value of offsets.retention.minutes is 20,160 minutes (14 days).

If Kafka determines that there are no active consumers in a consumer group (for example, when the consumer group is empty) and there are no offsets, Kafka will delete the consumer group.