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 PropertyStoreMappedCache entry is the maximum number of pages from the primary property cache that should be kept in memory at any one time.
|Range:||0 - 4294967295 (0xFFFFFFFF)|
The SecPropertyStoreMappedCache entry serves the same function for the secondary property cache.