去重（collapse）如何使用？

使用collapse去重后，返回结果可以按照设定的字段折叠，示例如下。

private static void UseCollapse(SyncClient client){ SearchQuery searchQuery = new SearchQuery(); MatchQuery matchQuery = new MatchQuery(); matchQuery.setFieldName("user_id"); matchQuery.setText("00002");

    searchQuery.setQuery(matchQuery);
    Collapse collapse = new Collapse("product_name"); //根据产品名去重

    searchQuery.setGetTotalCount(true);
    searchQuery.setCollapse(collapse);
    SearchRequest searchRequest = new SearchRequest("order","order_index",searchQuery);

    SearchResponse response = client.search(searchRequest);
    System.out.println(response.getTotalCount());
    System.out.println(response.getRows().size());   //有几种产品会返回几个产品名
}