title: Delete unused kafka consumer group
body: <p>I'm using Apache Kafka 0.10 with a compacted topic as a <strong>distributed cache synch mechanism</strong>. When the application starts up it generates an instance specific <code>consumer group id</code>. As instances are added and removed for horizontal scalability, obviously we get a large number of group ids that should never be used again.</p>
  <p>I'm sure that this is the perfect use case for <code>KStreams</code> and <code>KTables</code>, but I am trying to do this myself for intellectual reasons as well as that the <code>KStreams</code> and <code>KTables</code> are defined as alpha quality in 0.10.</p>
  <p>Is there a Kafka API call that I can use that could delete an existing consumer group, knowing that it should never be used again?</p>
  <p>Since Zookeeper is not maintaining consumer offsets in version 0.10, Is there a way delete the consumer group using Kafka?</p>