I had a customer this week that had:
- SharePoint 2013 Enterprise
- Windows Server 2012
- SQL Server 2012
Prior to applying Service Pack 1, Search was working without a hitch for the most part. However, shortly after applying service pack 1 (SP1), the customer started reporting that SharePoint Crawls, whether they were full with incremental, or using continuous crawl, would go from taking minutes to run, to running for 18+ hours and yield zero results (no successes, no warnings, no fruit whatsoever). More frustrating was that initial troubleshooting efforts would not yield any clues in Windows Event Logs or ULS/Diagnostic Logging.