@Override
    protected void doXContent(XContentBuilder builder) throws IOException {
        builder.field("query"); //$NON-NLS-1$
        queryBuilder.toXContent(builder);
    }
Empty query

@author Marc Savy {@literal <marc@rhymewithgravy.com>}
manager/api/es/src/main/java/io/apiman/manager/api/es/util/EmptyQueryBuilder.java