title: Google App engine renaming fields in ndb datastore
body: <p>I want to rename some field names in my model, i have copied the data from old field to new field. Now i want to delete the old fields. is there any convenient way of doing this ?</p>
  
  <p>there is a method described
  <a href="https://developers.google.com/appengine/articles/update_schema" rel="nofollow">here</a></p>
  
  <p>for removing the fields in db datastore, will it work for ndb datastore as well ?</p>