Process that hosts the writer with name OSearch15 VSS Writer and ID {0ff1ce15-0201-0000-0000-000000000000} does not run under a user with sufficient access rights.

Issue:

Process that hosts the writer with name OSearch15 VSS Writer and ID {0ff1ce15-0201-0000-0000-000000000000} does not run under a user with sufficient access rights.

Reason:
Your "Search Host Controller" may not be started as you expected. Also it will struck to start in the "Services.msc" console.
The reason is the account which is used for Search services does not have access rights to read the specific registry key.

Solution:
1. Make sure that you have added your "Serice Account" in the "Administrator group of SP server.
2. Open "Regedit" in the "Run" window
3. Go to "HKLM\System\CurrentControlSet\Services\VSS\VssAccessControl"
4. Do right click and add one more "DWORD" value for your search service as depicted below and set the value as "1"

5. Also you need to set the "Read" permission to the administrator group as depicted below

6. Now go and check your "Search Host Controller" service and it works fine.

That's it....