title: enable.auto.commit value is not configuring to true
body: <p>As per Kafka documentation, default value of consumer config enable.auto.commit is true. But I am getting as false. </p>
  
  <p>In my Kafka stream application, I try to change this to <code>true</code> as <code>props.put(StreamsConfig.consumerPrefix(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG), true)</code> to commit offset automatically. But I am getting <code>WARN o.a.k.s.StreamsConfig [main] Unexpected user-specified consumer config: enable.auto.commit found. User setting (true) will be ignored and the Streams default setting (false) will be used</code> message in log and reverting back to false.</p>
  
  <p>What would be the reason? Please help me.</p>