Note Indexing Service is no longer supported as of Windows XP and is unavailable for use as of Windows 8. Instead, use Windows Search for client side search and Microsoft Search Server Express for server side search.
The MaxShadowFreeForceMerge entry specifies the percentage of available disk space that can be used by shadow indexes on a catalog drive before a master merge is triggered.
|Range:||5 - 100|
If the percentage of disk space used by shadow indexes exceeds the value of the MaxShadowFreeForceMerge entry, and if the total free disk space falls below the minimum set in the MinDiskFreeForceMerge, a master merge begins.
Build date: 9/10/2012