The keys shown below are improperly detected by the Registry Cleaner. If removed, the Gatherer and Search encounter errors on reboot and the Search Index has to be rebuilt.
"HistoryHashMapFile"="C:\\ProgramData\\Microsoft\\Search\\Data\\Applications\\Windows\\Projects\\SystemIndex\\SystemIndex.Hash.gthr"
"DocIdMapFile"="C:\\ProgramData\\Microsoft\\Search\\Data\\Applications\\Windows\\Projects\\SystemIndex\\SystemIndex.Idm.gthr"
Here are a few of the Gatherer errors that occurs as found in the Event Viewer.
The gatherer is unable to read the registry DocIdMapFile.
Context: Application, SystemIndex Catalog
Details:
The system cannot find the file specified. (0x80070002)
The gatherer object cannot be initialized.
Context: Windows Application, SystemIndex Catalog
Details:
The registry value cannot be read because the configuration is invalid. Recreate the content index configuration by removing the content index. (0x80040d03)
The application cannot be initialized.
Context: Windows Application
Details:
The registry value cannot be read because the configuration is invalid. Recreate the content index configuration by removing the content index. (0x80040d03)