out.writeOptionalStringArray(activeFeatures != null ? activeFeatures.toArray(new String[0]) : null);
        out.writeOptionalString(storeName);
    }

    @Override
    protected void doXContent(final XContentBuilder builder, final Params params) throws IOException {
        builder.startObject(NAME);
        if (modelName != null) {
            builder.field(MODEL_NAME.getPreferredName(), modelName);
        }