code: @PublicEvolving
  	public void setString(ConfigOption<String> key, String value) {
  		setValueInternal(key.key(), value);
  	}
docs: Adds the given value to the configuration object.
  The main key of the config option will be used to map the value.
  
  @param key
  the option specifying the key to be added
  @param value
  the value of the key/value pair to be added