How to clean up `marked for deletion` in Kafka

After deleting topic as follows:

$ ./bin/kafka-topics.sh --delete --zookeeper localhost:2181 --topic my-topic
Topic my-topic is marked for deletion.
Note: This will have no impact if delete.topic.enable is not set to true.
$

you will still see the topic with `marked for deletion` as follows:

$ ./bin/kafka-topics.sh --list --zookeeper localhost:2181      
my-topic - marked for deletion
$

To clean it up, add the following line to `config/server.properties`:

delete.topic.enable=true

and restart the Kafka.

You can see the topic has gone away soon.