private void renderField(XMLWriter writer, String name, Object value) {
        writer.openTag(name);
        renderFieldContent(writer, value);
        writer.closeTag();
    }
Writes a hit's default attributes like 'type', 'source', 'relevance'.
container-search/src/main/java/com/yahoo/search/pagetemplates/result/PageTemplatesXmlRenderer.java