default void update(K key, Void update) {
    throw new SamzaException("Not supported");
  }
Updates the record associated with a given {@code key} with the specified {@code update}.

@param key the key with which the specified {@code value} is to be associated.
@throws NullPointerException if the specified {@code key} is {@code null}.
samza-api/src/main/java/org/apache/samza/table/ReadWriteTable.java