title: How to update internal changelog topic partitions when a source topic partition count is updated?
body: <p>I have an application in which I'm using a Kstream-Kstream join and Ktream-Ktable join.
  I have updated the input source topic partition count from 4 to 16 and the application stopped with below error. </p>
  
  <p><code>Could not create internal topics: Existing internal topic application-test-processor-KSTREAM-JOINTHIS-0000000009-store-changelog has invalid partitions. Expected: 16 Actual: 4. Use 'kafka.tools.StreamsResetter' tool to clean up invalid topics before processing. Retry #3</code></p>
  
  <p>How to update internal changelog topic partition count when a source topic partition count is updated ?</p>
  
  <p>Note: We are using kafka version: 0.10.2.1</p>
  
  <p>I looked at the application resetter tool from this link: <a href="https://docs.confluent.io/current/streams/developer-guide/app-reset-tool.html" rel="nofollow noreferrer">https://docs.confluent.io/current/streams/developer-guide/app-reset-tool.html</a>
  but it doesn't say how to update the changelog partition.</p>
  
  <p>Thanks in advance.</p>