code: @PublicEvolving
  	public String getValue(ConfigOption<?> configOption) {
  		Object o = getValueOrDefaultFromOption(configOption);
  		return o == null ? null : o.toString();
  	}
docs: Returns the value associated with the given config option as a string.
  
  @param configOption The configuration option
  @return the (default) value associated with the given config option