title: spring data mongodb @Query with exclude option
body: <p>Using spring data mongo repository class, how do we declare a method to return the documents with few fields excluded? Spring data reference document shows 'include' fields mechanism but not exclude.
  Code from <a href="http://docs.spring.io/spring-data/data-mongo/docs/1.4.1.RELEASE/reference/htmlsingle/" rel="nofollow">spring documentation</a>:</p>
  
  <pre><code>public interface PersonRepository extends MongoRepository&lt;Person, String&gt;
  
    @Query(value="{ 'firstname' : ?0 }", fields="{ 'firstname' : 1, 'lastname' : 1}")
    List&lt;Person&gt; findByThePersonsFirstname(String firstname);
  
  }
  </code></pre>
  
  <p>I need a mechanism to specify the fields to be excluded? Is this supported for repository methods?</p>