使用Java低级别Rest客户端的弹性搜索

Question

我正在尝试将我的弹性搜索（6.6.1）、spring boot（2.1.3）应用程序从Java8迁移到Java11。之前，我使用高级java rest客户端创建和搜索索引。因为存在一个问题(https://github.com/elastic/elasticsearch/issues/38299)在模块化高级rest客户端api时，我试图使用低级rest客户端，但无法获得任何搜索结果。

请看一些代码片段-

使用高级rest客户端创建的搜索索引

           IndexRequest indexRequest = new IndexRequest("legal3", "scee");
          IndexResponse indexResponse =  
          highlevelclient.index(indexRequest, RequestOptions.DEFAULT);

使用高级rest客户端进行搜索的查询

    this.client = new RestHighLevelClient(
            RestClient.builder(new HttpHost("localhost", 9200)));
    SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
    sourceBuilder.query(QueryBuilders.multiMatchQuery(text, “field1”));
    SearchRequest searchRequest = new SearchRequest();
    searchRequest.source(sourceBuilder);
    SearchResponse response1 = highlevelclient.search(searchRequest, RequestOptions.DEFAULT);

然后，我使用低级rest客户端搜索相同的索引（使用高级rest客户端创建的索引）

        this.client = RestClient.builder(
                new HttpHost("localhost", 9200)).build();
        String query = "{\"query\":{\"match\":{\"field1\":\"" + text + "\"}}}";
        Response response = lowlevlelclient.performRequest("GET", "legal3", Collections.emptyMap(), new StringEntity(query, ContentType.APPLICATION_JSON));

但是它只返回头，没有真正的数据。

{"legal3":{"aliases":{},"mappings":{"scee":{"properties”:”field1”:{“type":"text","fields":{"keyword":{"type":"keyword","ignore_above":256}}}}}},"settings":{"index":{"number_of_shards":"5","blocks":{"read_only_allow_delete":"true"},"provided_name":"legal3","creation_date":"1552209921359","number_of_replicas":"1","uuid":"Y_GyoagoTIezgztuUYrlBQ","version":{"created":"6060199"}}}}}

我觉得我在设定终点（performRequest的第二个参数）时犯了一些错误，但我找不到太多细节。

谁能给点建议吗。

Answer 1

我终于找到了解决办法。正如预期的那样，问题在于终点（performRequest的第二个参数）

Response response = lowlevelclient.performRequest("GET", "/_search", Collections.emptyMap(), new StringEntity(query, ContentType.APPLICATION_JSON));

现在我得到了预期的结果