title: The key format 'AVRO' is not currently supported
body: <p>i am following this blog in understanding ElasticSearchSink connector<br />
  <a href="https://github.com/confluentinc/demo-scene/tree/master/kafka-to-elasticsearch" rel="nofollow noreferrer">https://github.com/confluentinc/demo-scene/tree/master/kafka-to-elasticsearch</a></p>
  <pre><code>ksql&gt; CREATE STREAM TEST01 (ALPHA VARCHAR KEY,COL1 INT, COL2 VARCHAR)
         WITH (KAFKA_TOPIC='test01', PARTITIONS=1, FORMAT='AVRO');  
  </code></pre>
  <p>got the following error<br />
  <strong>The key format 'AVRO' is not currently supported.</strong></p>
  <p>i am using <strong>confluentinc/cp-ksqldb-server:latest</strong> and <strong>confluentinc/cp-ksqldb-cli:latest</strong></p>
  <p>As of Now, replaced <strong>FORMAT='AVRO'</strong> with <strong>VALUE_FORMAT='AVRO'</strong><br />
  didn't get any error, can anyone assist if this is the right way to go ?</p>