narrowed down collections used in test_indexing to testing_ppp and biosample
narrowed down collections used in test_indexing to testing_ppp and biosample

hms-dbmi/fourfront,hms-dbmi/fourfront,hms-dbmi/fourfront,4dn-dcic/fourfront,4dn-dcic/fourfront,4dn-dcic/fourfront,hms-dbmi/fourfront,hms-dbmi/fourfront,4dn-dcic/fourfront