title: Firestore AdminSDK retry timeout
body: <p>I have a node server using the admin sdk to listen for changes on documents and then write to a log.  I get these errors after 5 - 10 minutes of running.</p>
  
  <pre><code>(node:1088) UnhandledPromiseRejectionWarning: Error: Retry total timeout exceeded before any response was received
      at repeat (C:\connect2sql\node_modules\google-gax\build\src\api_callable.js:215:26)
      at Timeout._onTimeout (C:\connect2sql\node_modules\google-gax\build\src\api_callable.js:243:25)
      at ontimeout (timers.js:498:11)
      at tryOnTimeout (timers.js:323:5)
      at Timer.listOnTimeout (timers.js:290:5)
  </code></pre>
  
  <p>Any ideas how to extend the timeout or speed up google-gax?</p>