title: What happens to a Kafka consumer group on the Kafka server when the underlying Kafka topic is deleted?
body: <p>Let's say I have the Kafka topic <code>cars</code>.</p>
  <p>I also have a consumer group <code>cars-consumers</code> that is subscribed to the <code>cars</code> topic. The <code>cars-consumers</code> consumer group is currently at the offset 89.</p>
  <p>When I now delete the <code>cars</code> topic, what happens to the <code>cars-consumers</code> consumer group? Will it also be deleted?</p>
  <p>If not, what happens when I re-create a <code>cars</code> topic? Will the <code>cars-consumers</code> consumer group still be at offset 89?</p>