Hello,
Great module, I wander if its posible to return result grouped by file in the cases where a file is attached to multiple nodes.

Now each file is indexed as separated solr document representing the duple {file,node_parent} witch generates multiple results for the same file. This behaviour is natural when you have selected the recently-added feature Return node and not attachment, but I don't think its natural or practical when you use the traditional mode because each node its conceptually a different unique entity independent of the node its attached to. So has much more sense to show file result item once with the parent node list instead of different results. 

i.g. If you have the duples:   {file1,nodeA},{file1,nodeB},{file1,nodeC},{file1,nodeD}

the result should be:
   file1_name 
   file1_snippet
   attached to:
      - nodeA
      - nodeB
      - nodeC
      - ...

Don't know the best solution for this, maybe we could use the grouping feature of solr grouping by path field.