docs: public static String normalizeStartupMode(StartupMode startupMode) {
  		switch (startupMode) {
  			case EARLIEST:
  				return CONNECTOR_STARTUP_MODE_VALUE_EARLIEST;
  			case LATEST:
  				return CONNECTOR_STARTUP_MODE_VALUE_LATEST;
  			case GROUP_OFFSETS:
  				return CONNECTOR_STARTUP_MODE_VALUE_GROUP_OFFSETS;
  			case SPECIFIC_OFFSETS:
  				return CONNECTOR_STARTUP_MODE_VALUE_SPECIFIC_OFFSETS;
  		}
  		throw new IllegalArgumentException("Invalid startup mode.");
  	}