java - 如何在Elasticsearch中使用RestHighLevelClient获得不同的值？

Question

我在这里看到了帖子，你们为下面给出的链接提供了解决方案。
ElasticSearch Java API to get distinct values from the Query Builders

有什么方法可以使用org.elasticsearch.client.RestHighLevelClient获得不同的电子邮件吗？
您能帮我吗，我尝试了很多方法但无法解决。但是我能够在SQL Workbench中实现相同的功能，并且在下面使用Kibana转换器给出了等效的json查询。

SELECT DISTINCT email_client.keyword
FROM email_reference;

等效的Elasticsearch查询如下:

{
  "from": 0,
  "size": 0,
  "_source": {
    "includes": ["email_client.keyword"],
    "excludes": []
  },
  "stored_fields": "email_client.keyword",
  "aggregations": {
    "email_client.keyword": {
      "terms": {
        "field": "email_client.keyword",
        "size": 200,
        "min_doc_count": 1,
        "shard_min_doc_count": 0,
        "show_term_doc_count_error": false,
        "order": [
          {
            "_count": "desc"
          },
          {
            "_key": "asc"
          }
        ]
      }
    }
  }
}

因此，现在我想使用RestHighLevelClient进行此JSON查询，但我尝试过，但问题是RestHighLevelClient中没有prepareSearch()，使用RestHighLevelClient还有其他实现吗？

Answer 1

这应该与RestHighLevelClient一起使用:

        MultiSearchRequest multiRequest = new MultiSearchRequest();
        SearchRequest searchRequest = new SearchRequest();
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        searchSourceBuilder.size(0); // return only aggregation results
        searchSourceBuilder.aggregation(AggregationBuilders.terms("label_agg").field("email_client.keyword").size(200));
        searchRequest.indices("email_reference"); // index name
        searchRequest.source(searchSourceBuilder);
        multiRequest.add(searchRequest);
        MultiSearchResponse response = restHighLevelClient.msearch(multiRequest, RequestOptions.DEFAULT);