In the Central Admin. there are no errors reported.
Upon the user attempting to perform a search they get the message:
Sorry, something went wrong. Search has encountered a problem that prevents results from being returned. If the issue persists, please contact your administrator.
In the event log there are the following issues (in the application log):
Event 2548 (SharePoint Server Search) of severity 'Error' occurred 550 more time(s) and was suppressed in the event log
In the ULS log the following two errors keep occurring:
Content Plugin can not be initialized - list of CSS addresses is not set.
Failed to extract required parameter FastConnector:ContentDistributor, hr=0x80070002 [pluginconfig.cpp:81] search\native\gather\plugins\contentpi\pluginconfig.cpp
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