Here is a fix for SharePoint 2013 Search Application Error and Search Stops Working. In Central Admin under Search Administration, the following error shows: ~ Search Application Topology - Unable to retrieve topology component health states. This may be because the admin component is not up and running. ~ Clicking on Content Sources, the following error message shows: Sorry, something went wrong. ~ Query and crawl stopped working. The fix is to change the permissions on the database. Give the service account (demo\SP_SearchService) SPSearchDBAdmin role permissions.