Error 0x8004111C

Value: -2147217124 | 0x8004111C | 2147750172

What does it mean ?

IDX_E_CATALOG_DISMOUNTED  
The index was dismounted because it is being removed or the search service stopped. If the problem persists, restart the search service.
Value: 4380 | 0x111C | 0b0001000100011100

Where does it come from ?

FACILITY_ITF  
COM/OLE Interface management. FACILITY_ITF is designated for user-defined error codes returned from interface methods
Value: 4 | 0x004 | 0b00000100

StackOverflow

Other Errors for FACILITY_ITF