You try to run a search but is just sits there with a spinning circle. Reviewing the Coordinator log you see an error similar to the following:
"Could not allocate space for object '<temporary system object: 3458769402115325952>' in database 'tempdb' because the 'PRIMARY' filegroup is full. Create disk space by deleting unneeded files, dropping objects in the filegroup, adding additional files to the filegroup, or setting autogrowth on for existing files in the filegroup"