private RouterStore getRouterStore() throws Exception {
    return new RouterStore(new AccountServiceMetrics(registry), backupFileManager, helixStore,
        new AtomicReference<>(getRouter()), true, 100, accountServiceConfig);
  }
Create a {@link RouterStore}. This router store will overwrite the account metadata whene updating
the account metadata.
@return {@link RouterStore}.
@throws Exception Any unexpected exception.
ambry-tools/src/main/java/com/github/ambry/account/AccountTool.java