title: auto generate indexes in datastore-indexs.xml using google app engine
body: <p>I am stuck with a problem while developing an application using Google app engine. In one application screen I am using filtering and a sorting technique. In the development environment(in the local system) the screen is working perfectly but when we keep my project in the production environment (in the Google app engine cloud) I am getting an exception by accessing the same screen. </p>
  
  <p>I have searched the net to find the solution, I got the solution but that is very lengthy process. Here, my error is:</p>
  
  <pre><code> &lt;datastore-index kind="Exception" ancestor="false" source="manual"&gt;
              &lt;property name="packageName" direction="asc"/&gt;
              &lt;property name="model" direction="asc"/&gt;
              &lt;property name="exceptionDateTime" direction="desc"/&gt;
       &lt;/datastore-index&gt;
  </code></pre>
  
  <p>For this error to resolve I have created a <code>datastore-indexes.xml</code> file in the web-inf folder and the error is solved in the production environment, but like the error I have lot of indexes to write in the <code>datastore-indexes.xml</code>. Can anyone give me the clarification and limitations to writing all the indexes or any other process to create all the indexes automatically.</p>