Elasticsearch 查询学习

elasticsearch aggregation 聚合统计 

在项目中可以通过聚合统计数据，常用的平均值计算（avg），求和 （sum），数量统计（count）  ，最大值（max） 最小值（min）等 ，可以直接通过Aggregation得到计算结果

计算平均值 avg
GET company/user/_search
{
  "aggs": {
    "maxname": {
      "avg": {
        "field": "age"
      }
    }
  }
}

public void avg(){
    AvgAggregationBuilder avgAggregationBuilder =AggregationBuilders.avg("avg").field("age");
    SearchQuery searchQuery =new NativeSearchQueryBuilder()
            .withQuery(QueryBuilders.matchQuery("uid","1"))
            .addAggregation(avgAggregationBuilder)
            .build();
   elasticsearchTemplate.query(searchQuery,searchResponse -> {
       Avg avg =searchResponse.getAggregations().get("avg");
       System.out.println(avg.getValue());
       return null;
   });
}

统计某一字段数量 avg

GET company/user/_search
{
  "aggs": {
    "maxname": {
      "value_count": {
        "field": "age"
      }
    }
  }
}

public void avg(){
    ValueCountAggregationBuilder countAggregationBuilder =AggregationBuilders.count("count").field("age");
    SearchQuery searchQuery =new NativeSearchQueryBuilder()
            .withQuery(QueryBuilders.matchQuery("uid","1"))
            .addAggregation(countAggregationBuilder)
            .build();
   elasticsearchTemplate.query(searchQuery,searchResponse -> {
       ValueCount count =searchResponse.getAggregations().get("count");
       System.out.println(count.getValue());
       return null;
   });
}