Fix warning about deprecated pass-by-reference
Fix warning about deprecated pass-by-reference

bibliotechy/islandora_solr_search,whikloj/islandora_solr_search,jordandukart/islandora_solr_search,whikloj/islandora_solr_search,jordandukart/islandora_solr_search,bibliotechy/islandora_solr_search