title: Beta Firebase Firestore won't work with projects using app engine
body: <p>When I try to add the beta firestore to my Google cloud platform project I get the following message.</p>
  
  <p><strong><em>Cannot enable Firestore for this project</strong><br>
  Currently Firestore cannot be enabled in projects already using Cloud Datastore or App Engine</em></p>
  
  <p>Is this going to last forever?<br>
  I think I would like to replace some but not all of my datastore stuff with firestore to get realtime updates.</p>
  
  <p>Perhaps firestore uses datastore and appengine in its backend?</p>
  
  <p>Should I use two GCP projects to get around this problem?</p>
  
  <p>Thanks,
  Nathan</p>