public static boolean isIndexed(String rootPath) {
		File rootFile = new File(rootPath);
		if (!rootFile.isDirectory()) {
			return false;
		}
		File indexFile = new File(rootPath, INDEX_FILE);
		return indexFile.exists();
	}
Determine if the specified directory corresponds to an 
indexed filesystem.
@param rootPath filesystem root
@return true if filesystem contains an index (not mangled)
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/IndexedLocalFileSystem.java