private R applySchemaless(R record) {
        Object rawValue = operatingValue(record);
        if (rawValue == null || config.field.isEmpty()) {
            return newRecord(record, null, convertTimestamp(rawValue));
        } else {
            final Map<String, Object> value = requireMap(rawValue, PURPOSE);
            final HashMap<String, Object> updatedValue = new HashMap<>(value);
            updatedValue.put(config.field, convertTimestamp(value.get(config.field)));
            return newRecord(record, null, updatedValue);
        }
    }
Convert from the universal java.util.Date format to the type-specific format
connect/transforms/src/main/java/org/apache/kafka/connect/transforms/TimestampConverter.java