title: Translate FilterDefinition<TDocument> to regular json mongo query that i can run in a mongo shell
body: <p>I have many complex queries that I sometimes wish to check directly against Mongo for debugging \ explaining() purposes. 
  With the newer 2.0+ c# driver, i'm not sure how to do this. With the previous version there was a thing called <code>IMongoQuery</code> and <a href="https://stackoverflow.com/questions/10261156/translate-queryablet-back-to-imongoquery">This</a> worked.</p>
  
  <p>A simple example:</p>
  
  <pre><code>FilterDefinition&lt;LalalaEvent&gt; filter = Builders&lt;LalalaEvent&gt;.Filter
      .Where(e =&gt; ids.Contains(e.Id) &amp;&amp; e.Deleted != true );
  </code></pre>