java使用elasticsearch分组进行聚合查询过程解析

这篇文章主要介绍了java使用elasticsearch分组进行聚合查询过程解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

java连接elasticsearch 进行聚合查询进行相应操作

一：对单个字段进行分组求和

1、表结构图片：

根据任务id分组，分别统计出每个任务id下有多少个文字标题

1.SQL：select id, count(*) as sum from task group by taskid;

java ES连接工具类

public class ESClientConnectionUtil {
  public static TransportClient client=null;
  public final static String HOST = "192.168.200.211"; //服务器部署
  public final static Integer PORT = 9301; //端口

  public static TransportClient getESClient(){
    System.setProperty("es.set.netty.runtime.available.processors", "false");
    if (client == null) {
      synchronized (ESClientConnectionUtil.class) {
        try {
          //设置集群名称
          Settings settings = Settings.builder().put("cluster.name", "es5").put("client.transport.sniff", true).build();
          //创建client
          client = new PreBuiltTransportClient(settings).addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(HOST), PORT));
        } catch (Exception ex) {
          ex.printStackTrace();

          System.out.println(ex.getMessage());
        }
      }
    }
    return client;
  }
  public static TransportClient getESClientConnection(){
    if (client == null) {
      System.setProperty("es.set.netty.runtime.available.processors", "false");
        try {
          //设置集群名称
          Settings settings = Settings.builder().put("cluster.name", "es5").put("client.transport.sniff", true).build();
          //创建client
          client = new PreBuiltTransportClient(settings).addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName(HOST), PORT));
        } catch (Exception ex) {
          ex.printStackTrace();
          System.out.println(ex.getMessage());
      }
    }
    return client;
  }

  //判断索引是否存在
  public static boolean judgeIndex(String index){
    client= getESClientConnection();
     IndicesAdminClient adminClient;
    //查询索引是否存在
    adminClient= client.admin().indices();
    IndicesExistsRequest request = new IndicesExistsRequest(index);
    IndicesExistsResponse responses = adminClient.exists(request).actionGet();

    if (responses.isExists()) {
      return true;
    }
    return false;
  }
}

java ES语句（根据单列进行分组求和）

//根据 任务id分组进行求和
 SearchRequestBuilder sbuilder = client.prepareSearch("hottopic").setTypes("hot");
//根据taskid进行分组统计，统计出的列别名叫sum
 TermsAggregationBuilder termsBuilder = AggregationBuilders.terms("sum").field("taskid");

 sbuilder.addAggregation(termsBuilder);
 SearchResponse responses= sbuilder.execute().actionGet();
//得到这个分组的数据集合
 Terms terms = responses.getAggregations().get("sum");
 List<BsKnowledgeInfoDTO> lists = new ArrayList<>();
for(int i=0;i<terms.getBuckets().size();i++){
  //statistics
  String id =terms.getBuckets().get(i).getKey().toString();//id
  Long sum =terms.getBuckets().get(i).getDocCount();//数量
System.out.println("=="+terms.getBuckets().get(i).getDocCount()+"------"+terms.getBuckets().get(i).getKey());
}
//分别打印出统计的数量和id值

根据多列进行分组求和

//根据 任务id分组进行求和
 SearchRequestBuilder sbuilder = client.prepareSearch("hottopic").setTypes("hot");
//根据taskid进行分组统计，统计出的列别名叫sum
 TermsAggregationBuilder termsBuilder = AggregationBuilders.terms("sum").field("taskid");
//根据第二个字段进行分组
 TermsAggregationBuilder aAggregationBuilder2 = AggregationBuilders.terms("region_count").field("birthplace");
//如果存在第三个，以此类推；
 sbuilder.addAggregation(termsBuilder.subAggregation(aAggregationBuilder2));
 SearchResponse responses= sbuilder.execute().actionGet();
//得到这个分组的数据集合
 Terms terms = responses.getAggregations().get("sum");
 List<BsKnowledgeInfoDTO> lists = new ArrayList<>();
for(int i=0;i<terms.getBuckets().size();i++){
  //statistics
  String id =terms.getBuckets().get(i).getKey().toString();//id
  Long sum =terms.getBuckets().get(i).getDocCount();//数量
System.out.println("=="+terms.getBuckets().get(i).getDocCount()+"------"+terms.getBuckets().get(i).getKey());
}
//分别打印出统计的数量和id值

对多个field求max/min/sum/avg

SearchRequestBuilder requestBuilder = client.prepareSearch("hottopic").setTypes("hot");
//根据taskid进行分组统计，统计别名为sum
    TermsAggregationBuilder aggregationBuilder1 = AggregationBuilders.terms("sum").field("taskid")
//根据tasktatileid进行升序排列
        .order(Order.aggregation("tasktatileid", true));
// 求tasktitleid 进行求平均数 别名为avg_title

    AggregationBuilder aggregationBuilder2 = AggregationBuilders.avg("avg_title").field("tasktitleid");
//
    AggregationBuilder aggregationBuilder3 = AggregationBuilders.sum("sum_taskid").field("taskid");
    requestBuilder.addAggregation(aggregationBuilder1.subAggregation(aggregationBuilder2).subAggregation(aggregationBuilder3));
    SearchResponse response = requestBuilder.execute().actionGet();

    Terms aggregation = response.getAggregations().get("sum");
    Avg terms2 = null;
    Sum term3 = null;
    for (Terms.Bucket bucket : aggregation.getBuckets()) {
      terms2 = bucket.getAggregations().get("avg_title"); // org.elasticsearch.search.aggregations.metrics.avg.InternalAvg
      term3 = bucket.getAggregations().get("sum_taskid"); // org.elasticsearch.search.aggregations.metrics.sum.InternalSum
      System.out.println("编号=" + bucket.getKey() + ";平均=" + terms2.getValue() + ";总=" + term3.getValue());
    }

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