gsearch update is throwing errors likely connected to sianct.  There are exceptions found in the logs which may or may not be related.

In the fedoragsearchdaily.log there are a number of exceptions like the ones below:

fedoragsearch.daily.log.2017-10-22:INFO 2017-10-22 21:46:26,404 (OperationsImpl) updateIndex fromPid indexName=gsearch_solr indexDirSpace=9130605086 docCount=7421675
fedoragsearch.daily.log.2017-10-22:INFO 2017-10-22 21:51:51,404 (OperationsImpl) IndexDocument=ct:5120092 insertTotal=1 updateTotal=0 deleteTotal=0 emptyTotal=0 warnCount=0 docCount=742
1710

SystemId Unknown; Line #189; Column #130; Can not load requested doc: http://oris-srv04.si.edu:8080/fedora/objects//datastreams/FGDC/content
dk.defxws.fedoragsearch.server.errors.GenericSearchException: Wed Aug 23 20:20:34 EDT 2017 Connection error (is Solr running at http://oris-srv04.si.edu:8090/solr/gsearch_sianct/update  
?): java.io.IOException: Server returned HTTP response code: 400 for URL: http://oris-srv04.si.edu:8090/solr/gsearch_sianct/update