public class AttrFieldBridge implements FieldBridge {

public void set(String name, Object value, Document document, LuceneOptions luceneOptions) {
    if (value != null) {
        @SuppressWarnings("unchecked")
        List<Attribute> attrs = (List<Attribute>) value;
        for (Attribute attr : attrs){
            String fieldName = name+"_"+attr.getAttributeId();
            double fieldValue = attr.getVal();

            document.add(new DoubleDocValuesField(fieldName, fieldValue));
            document.add(new DoubleField(fieldName, fieldValue, Field.Store.NO));
        }
    }
}