//Retrieves all the categories facets
public Dictionary <string, int> FacetSearchGetAll()
{
Dictionary <string, int> d = new Dictionary <string, int>();
var r = solr.FacetFieldQuery(new SolrFacetFieldQuery("_categories_"));
foreach (var i in r)
{
d.Add(i.Key, i.Value);
}
return(d);
}