title: What is delete.topic.enable in kafka
body: <p>I am new to Kafka, I have created some topic called <code>Hell0-Kafka3</code></p>
  
  <p>Now I want to delete it. So I am issuing a command like this: </p>
  
  <pre><code>$ bin/kafka-topics.sh --zookeeper localhost:2181 --delete --topic Hello-Kafka3
  Topic Hello-Kafka3 is marked for deletion.
  Note: This will have no impact if delete.topic.enable is not set to true.
  </code></pre>
  
  <p>Can someone help me to understand <strong>Note:</strong> on the last line ??</p>