ElasticSearch 6.x 学习笔记：29.Java API之Match All Query

package cn.hadron;

import cn.hadron.es.ESUtil;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import java.util.Map;

public class MatchAllQuery {
    public static void main(String[] args) {
        TransportClient client = ESUtil.getClient();
        //构造查询对象
        QueryBuilder query= QueryBuilders.matchAllQuery();
        //搜索结果存入SearchResponse
        SearchResponse response=client.prepareSearch("my-index")
                .setQuery(query) //设置查询器
                .setSize(3)      //一次查询文档数
                .get();
        SearchHits hits=response.getHits();
        for(SearchHit hit:hits){
            System.out.println("source:"+hit.getSourceAsString());
            System.out.println("index:"+hit.getIndex());
            System.out.println("type:"+hit.getType());
            System.out.println("id:"+hit.getId());
            //遍历文档的每个字段
            Map<String,Object> map=hit.getSourceAsMap();
            for(String key:map.keySet()){
                System.out.println(key+"="+map.get(key));
            }
            System.out.println("--------------------");
        }
    }
}

no modules loaded
loaded plugin [org.elasticsearch.index.reindex.ReindexPlugin]
loaded plugin [org.elasticsearch.join.ParentJoinPlugin]
loaded plugin [org.elasticsearch.percolator.PercolatorPlugin]
loaded plugin [org.elasticsearch.script.mustache.MustachePlugin]
loaded plugin [org.elasticsearch.transport.Netty4Plugin]
source:{
  "name":"程裕强",
  "age":31,
  "gender":"男",
  "salary":20000,
  "dep":"bigdata"
}

index:my-index
type:persion
id:5
gender=男
name=程裕强
salary=20000
age=31
dep=bigdata
--------------------
source:{
  "name":"李四",
  "age":26,
  "gender":"女",
  "salary":15000,
  "dep":"bigdata"
}

index:my-index
type:persion
id:2
gender=女
name=李四
salary=15000
age=26
dep=bigdata
--------------------
source:{
  "name":"刘六",
  "age":27,
  "gender":"女",
  "salary":18000,
  "dep":"AI"
}

index:my-index
type:persion
id:4
gender=女
name=刘六
salary=18000
age=27
dep=AI
--------------------

Process finished with exit code 0