This module extends the feature by adding a complex nodereference fields auto-fill using the Solr Assistant filters features as backend. This means you can attach a SolR filter instance to node reference fields. Then, node owners can configure a complex SolR query using the SolR Assistant simple filter form in order to configure the content the would want to see in their node reference. Notice that this module only feeds node reference fields using on site content, so you might want to use this module side by side to the Feeds module.