RestClient for Elastic Search

Question

I am trying to fetch data from Elastic search cluster. Index Name : testIndex Type : testType host : localhost port : 8080

I want to use Elastic Search 5.4 version and using RestClient I would like to fetch data using multimatch query.

Sample Query would look something like this.

GET testIndex/testType/_search
{
  "query": {
    "multi_match": {
      "query":"slabs",
      "fields": ["field1","field2"]
    }
  }
}

What would be the best way to do that ? Is it possible that I can use QueryBuilder to build queries and use that with rest client.

Answer 1

发布版本6时，RestClient的QueryBuilder将可用。将有一个低级别和一个高级别的REST客户端。高级REST客户端将支持QueryBuilder。你可以在这里玩它：

QueryBuilder with High Level REST Client

在此之前，QueryBuilder不适用于REST客户端，因此在版本5.4中，您需要自己构建查询。有很多方法可以做到这一点。

一种方法是使用jTwig之类的语言模板。 Jettro Coenradie here解释了如何做到这一点的一个非常好的例子。

Answer 2

RestClient client = new RestClient(serverhost, port,username, password);
SearchSourceBuilder query = new SearchSourceBuilder();
SearchRequest searchRequest = new SearchRequest(IndexName);
searchRequest.source(query);
SearchResponse searchResponse = restClient.search(IndexName , query);

您应该使用Rest客户端创建与elasticsearch的连接，对于查询请求和搜索响应，应该使用SearchSourceBuilder，SearchRespons。对于查询，您可以使用弹性搜索的QueryBuilders。