private void refreshReadOnlyIndex() throws IOException {
		if (emptyFilesystem) {
			// read-only filesystem created as empty filesystem
			// with no index
			return;
		}
		readIndex();
		indexJournal = new IndexJournal();
	}
Construct existing indexed filesystem with an empty index.
This can be used to prepare for rebuilding the filesystem index.
@param rootPath
@throws IOException
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/IndexedLocalFileSystem.java