Over the weekend, we upgraded our search boxes to Solr 3.5 – which now offers grouping support for distributed searches (SOLR-2066 & SOLR-2776). Due to our ever increasing set of search data, we have been indexing our search content to multiple Solr shards for quite some time now. As a result, we have not been able to experiment with this powerful feature … but not anymore!

To read more about result grouping, check out Solr’s wiki: http://wiki.apache.org/solr/FieldCollapsing