I want to group my results by a field named "group_id". According to http://wiki.apache.org/solr/FieldCollapsing , for each unique value of group_id a docList with the top scoring document is returned.
But in my case I want to sort the results within each "group_id" by an int
field "popularity" instead. So within each "group_id" I just want the document
with the highest "popularity".
Is it possible to do that?
Thanks.
