Cheng Tan created KAFKA-9862:
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             Summary: Enable --if-exists and --if-not-exists for AdminClient in 
TopicCommand
                 Key: KAFKA-9862
                 URL: https://issues.apache.org/jira/browse/KAFKA-9862
             Project: Kafka
          Issue Type: New Feature
            Reporter: Cheng Tan
            Assignee: Cheng Tan


In *kafka-topic.sh*, we expect to use --if-exists to ensure that the topic to 
create or change exists. Similarly, we expect to use --if-not-exists to ensure 
that the topic to create or change does not exist. Currently, only 
*ZookeeperTopicService* supports these two options and we want to introduce 
them to *AdminClientTopicService.*



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