title: Solr 4.0 quering and filter by _version_
body: <p>I have an index which I update every few hours using Solrj.
  The update contains new Docs and it also updates for excising Docs in index. Some won't be updated at all (consider as deleted after the update).</p>
  
  <p>In each update I want to change the <em>version</em> field in all Docs that were updated.
  currently i'm using:</p>
  
  <pre><code>&lt;field name="_version_" type="long" indexed="true" stored="true" /&gt;
  </code></pre>
  
  <p>The problem is that each Doc gets the unix time of its creation.
  Is there a way to Auto-increment the <em>version</em> field for all new/updated Docs and also to filter the results in search query by latest <em>version</em>?</p>