如何对Spring Data Elasticsearch中的术语汇总创建的所有存储桶的doc_counts求和

Question

我想对条款查询返回的所有存储桶的doc_counts求和。我将Jest Client用于Spring Data Elasticsearch。

   BoolQueryBuilder boolQueryBuilder = 
   QueryBuilders.boolQuery().must(matchAllQuery());
    SearchSourceBuilder searchBuilder = SearchSourceBuilder
        .searchSource()
        .size(100)
        .query(boolQueryBuilder)
        .aggregation(
            AggregationBuilders
                .terms("item_sum")
                .field("itemId")
        );
    Search search = new Search.Builder(searchBuilder.toString())
        .addIndex("orders")
        .build();
    try {
        SearchResult result = jestClient.execute(search);
        TermsAggregation aggregation = result.getAggregations().getTermsAggregation("item_sum");
    } catch (IOException e) {
        e.printStackTrace();
    }

我想汇总itemId唯一的所有项目，然后对其文档计数求和。但是当我执行上面的代码时，它只给我前10条记录。但是我想对索引中存在的所有记录执行此查询。