void removeBuffer(int id) {
		setModified();
		try {
			int vfIndex = bufferIndexMap.remove(id);
			vfIndexProvider.freeIndex(vfIndex);
		}
		catch (NoValueException e) {
			// ignore?
		}
	}
Remove a buffer previously stored to the snapshot
by removing it from the map.  It is OK to invoke
this method for an index whose buffer was never
put into this file.
@param id buffer ID
Ghidra/Framework/DB/src/main/java/db/buffers/RecoveryFile.java