public static KnownVersion getKnownVersion(final short ordinal) {
    if (ordinal == TOKEN_ORDINAL) {
      return TOKEN;
    }
    if (ordinal < TOKEN_ORDINAL || ordinal >= VALUES.length) {
      return null;
    }
    return VALUES[ordinal];
  }
@return KnownVersion for ordinal if known, otherwise null.
geode-serialization/src/main/java/org/apache/geode/internal/serialization/KnownVersion.java