Empty Facets in Solr

How do I avoid displaying empty facet values in my Appkit visualisation?

By default Solr will return all the facet values for a given facet field, regardless of whether they match any documents in the result sets.

This behaviour is controlled by the Solr facet.mincount configuration parameter which defaults to 0.

Setting the facet.mincount parameter to 1 will ensure that only values which match at least one document will be returned in the facet list.

This can be done by adding a custom parameter at query time or by modifying the search handler in the solrconfig.xml file for the relevant collection.