Account getAccountByName(String name) {
    return nameToAccountMap.get(name);
  }
Gets {@link Account} by its name.
@param name The id to get the {@link Account}.
@return The {@link Account} with the given name, or {@code null} if such an {@link Account} does not exist.
ambry-account/src/main/java/com/github/ambry/account/AccountInfoMap.java