about lucene grouping and facet history
http://www.searchworkings.org/blog/-/blogs/result-grouping-field-collapsing-with-solr/
alsk named as Field Collapsing
this is different with facet,
when you first glance ,you'll problely confused about this two concept
http://www.searchworkings.org/blog/-/blogs/search-result-grouping-field-collapsing-in-lucene-solr/
http://stackoverflow.com/questions/8550818/whats-the-difference-between-grouping-and-facet-in-lucene-3-5
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