public static ConfigDef newConfigDef() {
        return new ConfigDef().define(TYPE_CONFIG, Type.STRING, ConfigDef.NO_DEFAULT_VALUE,
                                      in(ConverterType.KEY.getName(), ConverterType.VALUE.getName(), ConverterType.HEADER.getName()),
                                      Importance.LOW, TYPE_DOC);
    }
Create a new {@link ConfigDef} instance containing the configurations defined by ConverterConfig. This can be called by subclasses.

@return the ConfigDef; never null
connect/api/src/main/java/org/apache/kafka/connect/storage/ConverterConfig.java