specify the fields to load from documents in GoodsGroupCollector

mall-search/src/main/java/com/uas/search/grouping/GoodsGroupCollector.java

@@ -46,7 +46,7 @@ public class GoodsGroupCollector extends SimpleCollector {
     @Override
     public void collect(int doc) throws IOException {
         if (null != reader) {
-            Document document = reader.document(doc);
+            Document document = reader.document(doc, fieldsToLoad);
             String uniqueValue = document.get(uniqueField);
             // 排除重复值
             if (!StringUtils.isEmpty(uniqueValue)) {