protected void renderFieldContents(Object field) throws IOException {
            if (field instanceof Inspectable && ! (field instanceof FeatureData)) {
                renderInspector(((Inspectable)field).inspect());
            } else {
                accept(field);
            }
        }
Call after all fields in a hit to close the "fields" field of the JSON object
container-search/src/main/java/com/yahoo/search/rendering/JsonRenderer.java