sunburnt_query: use .filter() for the entity_type. Solr than does caching
sunburnt_query: use .filter() for the entity_type. Solr than does caching

Solr works with a filter cache. Filter results can get cached. Queries
do not get cached.

alkadis/vcv,alkadis/vcv,alkadis/vcv,phihag/adhocracy,SysTheron/adhocracy,liqd/adhocracy,phihag/adhocracy,phihag/adhocracy,DanielNeugebauer/adhocracy,liqd/adhocracy,SysTheron/adhocracy,liqd/adhocracy,phihag/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy,alkadis/vcv,alkadis/vcv,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy,SysTheron/adhocracy,liqd/adhocracy