o actually index,
                      'service_instance_id' - The serviceGuid of your instance of the retrieve and rank
                      service (required if dry_run=false), 'cluster_id' - The Solr cluster id for your retrieve
                      and rank service instance (required if dry_run=false), 'search_collection' - The name of
                      your Solr search collection from your retrieve and rank service instance (required if
                      dry_run=false), and 'fields' - Config