title: how to set livy.server.session.timeout on EMR cluster boostrap?
body: <p>I am creating an EMR cluster, and using jupyter notebook to run some spark tasks.
  My tasks die after approximately 1 hour of execution, and the error is:</p>
  
  <pre><code>An error was encountered:
  Invalid status code '400' from https://xxx.xx.x.xxx:18888/sessions/0/statements/20 with error payload: "requirement failed: Session isn't active."
  </code></pre>
  
  <p>My understanding is that it is related to the Livy config <code>livy.server.session.timeout</code>, but I don't know how I can set it in the bootstrap of the cluster (I need to do it in the bootstrap because the cluster is created with no ssh access)</p>
  
  <p>Thanks a lot in advance</p>