title: Spring data mongodb - aggregation framework integration
body: <p>I started to use <code>MongoDB</code> database in my application and for data access I have chosen Spring Data for MongoDB.</p>
  
  <p>I skimmed API reference and documentation and I can see that there is map-reduce integration but what about aggregation framework?  I can see that it supports group by operation, which would indicate that it supports <code>$group</code> operator judging from this: <a href="http://docs.mongodb.org/manual/reference/sql-aggregation-comparison/">http://docs.mongodb.org/manual/reference/sql-aggregation-comparison/</a>, but what about other operators, are that not supported for now?</p>
  
  <p>I am asking this question because I wanted to know what kind of integration with <code>MongoDB</code> Sping Data provides so I know what to expect, so to speak.</p>