title: Filter entities on a sub-entity property in Google Datastore query
body: <p>My Datastore entities are going to have properties of <a href="https://cloud.google.com/datastore/docs/concepts/entities" rel="noreferrer">embedded entity type</a>. </p>
  
  <p>After I save them as following (<strong>I'm using gcloud v0.27.0</strong>):</p>
  
  <pre><code>dataset.save([{
      key: dataset.key({ path: ['MyKind', 1] }),
          data: {
              foo: 'bar',
              zxc: {
                  nested: {
                      foobar: 32
                  }
              }
          }
      }, 
      {
          key: dataset.key({ path: ['MyKind', 2] }),
          data: {
              foo: 'a string',
              zxc: {
                  nested: {
                      foobar: 132
                  }
              }
          }
      }
      ], function(error) { console.log(error); });
  </code></pre>
  
  <p><strong>Is there any way to query entities that, say, have <code>zxc.nested.foobar=132</code>?</strong></p>
  
  <p>I run query like on the picture below and it shows no result.</p>
  
  <p><a href="https://i.stack.imgur.com/jyAa7.png" rel="noreferrer"><img src="https://i.stack.imgur.com/jyAa7.png" alt="enter image description here"></a></p>