> The current grouping functionality using group.field is basically > all-or-nothing: all documents will be grouped by the field value or none > will. So there would be no way to, for example, collapse just the videos or > images like they do in google. When using the group.field option values must be the same otherwise they don't get grouped together. Maybe fuzzy grouping would be nice. Grouping videos and images based on mimetype should be easy, right? Videos have a mimetype that start with video/ and images have a mimetype that start with image/. Storing the mime type's subtype and type in separate fields and group on the type field would do the job. Off course you need to know the mimetype during indexing, but solutions like Apache Tika can do that for you.
-- Met vriendelijke groet, Martijn van Groningen
