code: private FileSystem createFileSystem(URI configKey) throws ConfigStoreCreationException {
      try {
        return FileSystem.get(createFileSystemURI(configKey), new Configuration());
      } catch (IOException | URISyntaxException e) {
        throw new ConfigStoreCreationException(configKey, e);
      }
    }
docs: Creates a {@link FileSystem} given a user specified configKey.