/**
     * 多欄位分組並求和；實現sql:select field1, field2, sum(field3) from table_name group by field1, field2;
     */
    @Test
    public void sumAfterTwiceAgg() {
        SearchResponse response = client.prepareSearch("twitter").setTypes("tweet")
                .addAggregation(AggregationBuilders.terms("userAgg"
 
).field("user.keyword")
                        .subAggregation(AggregationBuilders.terms("sexAgg").field("sex.keyword")
                                .subAggregation(AggregationBuilders.sum("sumAgg").field("age"))))  //求和要放到最內層的分組語句裡面

                .get();
        Terms userAgg = response.getAggregations
 
().get("userAgg");
        for (Terms.Bucket entry : userAgg.getBuckets()) {
            Terms sexAgg = entry.getAggregations().get("sexAgg");
            for (Terms.Bucket entry2 : sexAgg.getBuckets()) {
                Sum sum = entry2.getAggregations().get("sumAgg");
                System.out.println
 
("user:" + entry.getKey()+"-------sex:"+entry2.getKey() + "----------sum:" + sum.getValue());
            }
        }
    }