java - Elasticsearch Java High Level Client 7.3.1:聚合以搜索响应中的索引明智命中

我正在使用ES 7.3.1和Elasticsearch高级客户端7.3.1
我们有一个包含3个索引的别名。

Alias Name :  employee_search
Indexes in this alias : contract_employee,permanent_employee,client

我正在搜索这个别名

SearchRequest searchReq = new SearchRequest("employee_search");
WrapperQueryBuilder qb = QueryBuilders.wrapperQuery(searchQuery); //i am preparing a dsl query
SearchSourceBuilder sbb = new SearchSourceBuilder();
sbb.query(qb);
searchReq.source(sbb);
SearchResponse resp = esClient.search(searchReq, RequestOptions.DEFAULT);

作为响应，我需要一个聚合，在这里我可以获取明智的索引匹配(哪个索引提供了多少匹配？)
需要实现的汇总是

{
  "aggs": {
    "index_wise_count": {
      "terms": {
        "field": "_index"
      }
    }
  }
}

如何在现有的搜索响应中实现这一点？
我试过但没用的方法:

SearchRequest searchReq = new SearchRequest("employee_search");
    WrapperQueryBuilder qb = QueryBuilders.wrapperQuery(searchQuery); //i am preparing a dsl query
    SearchSourceBuilder sbb = new SearchSourceBuilder();
    sbb.query(qb);
    sbb.aggreagation(AggregationBuilders.terms("index_wise_count").field("index"));
    searchReq.source(sbb);
    SearchResponse resp = esClient.search(searchReq, RequestOptions.DEFAULT);

最佳答案

我错过了一个下划线:(

sbb.aggreagation(AggregationBuilders.terms("index_wise_count").field("_index"));