@Deprecated
    @Override
    public ConfigSource fromPropertiesAsIs(final Properties properties) {
        final ObjectNode sourceNode = new ObjectNode(JsonNodeFactory.instance);
        final DataSource dataSource = new DataSourceImpl(model, sourceNode);
        for (final String key : properties.stringPropertyNames()) {
            dataSource.set(key, properties.getProperty(key));
        }
        return new DataSourceImpl(model, sourceNode);
    }
Creates ConfigSource from java.util.Properties as-is.

<p>Users and plugins MUST NOT call this directly. No any compatibility is guaranteed.
embulk-deps/src/main/java/org/embulk/deps/config/ConfigLoaderDelegateImpl.java