title: How to solve the Index warning on GAE?
body: <p>We have introduced a new model to our Datastore a few days ago. Surprisingly I still get Index warnings</p>
  
  <pre><code>W 2014-02-09 03:38:28.480
  suspended generator run_to_queue(query.py:938) raised NeedIndexError(no matching index found.
  The suggested index for this query is:
  - kind: FeelTrackerRecord
    ancestor: yes
    properties:
    - name: timestamp)
  
  W 2014-02-09 03:38:28.480
  suspended generator helper(context.py:814) raised NeedIndexError(no matching index found.
  The suggested index for this query is:
  - kind: FeelTrackerRecord
    ancestor: yes
    properties:
    - name: timestamp)
  </code></pre>
  
  <p>even though the index is served under <code>DataStore Indexes</code></p>
  
  <p><img src="https://i.stack.imgur.com/9esRo.png" alt="enter image description here"></p>
  
  <pre><code>indexes:
  
  # AUTOGENERATED
  
  # This index.yaml is automatically updated whenever the dev_appserver
  # detects that a new type of query is run.  If you want to manage the
  # index.yaml file manually, remove the above marker line (the line
  # saying "# AUTOGENERATED").  If you want to manage some indexes
  # manually, move them above the marker line.  The index.yaml file is
  # automatically uploaded to the admin console when you next deploy
  # your application using appcfg.py.
  
  
  - kind: FeelTrackerRecord
    ancestor: yes
    properties:
    - name: record_date
    - name: timestamp
  </code></pre>
  
  <p>What am I missing please?</p>