private void logRebuildError(String text) throws IOException {
		if (rebuildErrWriter == null) {
			File file = new File(root, REBUILD_ERROR_FILE);
			file.delete();
			rebuildErrWriter = new PrintWriter(
				new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file))));
		}
		rebuildErrWriter.println(text);
	}
Attempt to parse index version
@param firstIndexLine
@return index version or -1 if index version unknown
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/IndexedLocalFileSystem.java