详解 ElasticSearch 基础教程

鱼儿の记忆2023-10-12 2:03
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🌹 ElasticSearch 基础教程，请指教。
 
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理论

Elasticsearch: The Official Distributed Search & Analytics Engine | ElasticElasticsearch is the leading distributed, RESTful, free and open search and analytics engine designed for speed, horizontal scalability, reliability, and easy management. Get started for free.https://www.elastic.co/elasticsearch/

Elasticsearch是基于Apache Lucene的搜索服务器它的最新版本是8.10.2。

Elasticsearch是一个实时的分布式开放源代码全文本搜索和分析引擎。可从RESTful Web服务界面访问它，并使用无模式的JSON（JavaScript对象表示法）文档存储数据。它基于Java编程语言构建，因此Elasticsearch可以在不同平台上运行。它使用户能够以很高的速度浏览大量的数据。

Elasticsearch & MYSQL

索引

对比关系型数据库，创建索引就等同于创建数据库

创建

复制代码 
PUT /shopping

HTTP 的 PUT 请求

查看

单个索引

复制代码 
GET /shopping

HTTP 的 GET 请求

全部索引

复制代码 
GET /_cat/indices?v

HTTP 的 GET 请求

删除

复制代码 
DELETE /shopping

HTTP 的 DELETE 请求

文档

创建

随机ID

复制代码 
POST /shopping/_doc
{
  "title":"华为meta60pro",
  "category":"手机",
  "images":"https://www.gulixueyuan.com/xm.jpg",
  "price":"6499.00"
}

自定义ID

复制代码 
POST /shopping/_doc/1000
{
  "title":"华为meta60pro max",
  "category":"手机",
  "images":"https://www.gulixueyuan.com/xm.jpg",
  "price":"7499.00"
}

PUT /shopping/_doc/1002
{
  "title":"华为meta60pro max尊享",
  "category":"手机",
  "images":"https://www.gulixueyuan.com/xm.jpg",
  "price":"8499.00"
}

查询

主键查询

不存在查询

全部查询

复制代码 
GET /shopping/_search

修改

全量更新

复制代码 
PUT /shopping/_doc/1002
{
  "title":"华为meta60pro max尊享",
  "category":"手机",
  "images":"https://www.gulixueyuan.com/xm.jpg",
  "price":"12999.00"
}

修改

修改后

局部更新

复制代码 
POST /shopping/_update/1002
{
  "doc":{
    "title":"华为meta70pro max尊享"
  }
}

删除

复制代码 
DELETE /shopping/_doc/1000

复杂查询

请求路径方式

复制代码 
GET /shopping/_search?q=category:手机

请求体方式

属性查询
复制代码 
GET /shopping/_search
{
  "query":{
    "match": {
      "category": "手机"
    }
  }
}
全量查询
复制代码 
GET /shopping/_search
{
  "query":{
    "match_all": {}
  }
}
分页查询
复制代码 
GET /shopping/_search
{
  "query":{
    "match_all": {}
  },
  "from": 1,
  "size": 2
}
指定返回属性
复制代码 
GET /shopping/_search
{
  "query":{
    "match_all": {}
  },
  "from": 1,
  "size": 2,
  "_source": ["price","title"]
}
排序
复制代码 
GET /shopping/_search
{
  "query":{
    "match_all": {}
  },
  "from": 1,
  "size": 2,
  "_source": ["title"],
  "sort": [
    {
      "title": {
        "order": "desc"
      }
    }
  ]
}
错误
复制代码 
# 设置属性类型
PUT shopping/_mapping
{
    "properties": {
      "price": {
        "type": "text"
      },
      "title": {
        "fielddata": true, 
        "type": "text"
      }
    }
}

查询结果

组合查询

同时满足所有条件

复制代码 
## SQL: category="手机" AND price="6499.00"
GET /shopping/_search
{
  "query":{
    "bool": {
      "must": [
        {
          "match": {
          "category": "手机"
        }
        },
        {
          "match": {
            "price": "6499.00"
          }
        }
      ]
    }
  }
}

满足某个条件

复制代码 
## SQL: category="手机" OR price="6499.00" 
GET /shopping/_search
{
  "query":{
    "bool": {
      "should": [
        {
          "match": {
          "category": "手机"
        }
        },
        {
          "match": {
            "price": "6499.00"
          }
        }
      ]
    }
  }
}

范围查询

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## SQL: (category="手机" OR price=6499.00) and (price between 6500 and 10000) 
GET /shopping/_search
{
  "query":{
    "bool": {
      "should": [
        {
          "match": {
          "category": "手机"
        }
        },
        {
          "match": {
            "price": 6499.00
          }
        }
      ],
      "filter": {
        "range": {
          "price": {
            "gt": 6500,
            "lt": 10000
          }
        }
      }
    }
  }
}

分页排序

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# SQL: (category="手机" OR price=6499.00) and (price between 6500 and 10000)  limit 2 order by price desc
GET /shopping/_search
{
  "query":{
    "bool": {
      "should": [
        {
          "match": {
          "category": "手机"
        }
        },
        {
          "match": {
            "price": 6499.00
          }
        }
      ],
      "filter": {
        "range": {
          "price": {
            "gt": 6500,
            "lt": 10000
          }
        }
      }
    }
  },
  "from": 0,
  "size": 2,
  "sort": [
      {
      "price": {
        "order": "desc"
      }
    }
  ]
}

高亮显示

复制代码 
GET /shopping/_search
{
  "query":{
    "match_phrase": {
      "category": "手机"
    }
  },
  "highlight": {
    "fields": {
      "category": {}
    }
  }
}

聚合查询

分组聚合

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GET /shopping/_search
{
 "aggs": {
   "cacl_avg": {
     "terms": {
       "field":"price"
     }
   }
 },
 "size": 0
}

计算平均值

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GET /shopping/_search
{
 "aggs": {
   "cacl_avg": {
     "avg": {
       "field":"price"
     }
   }
 },
 "size": 0
}

创建映射关系

映射关系

复制代码 
PUT /user/_mapping
{
  "properties": {
    "user":{
      "type": "text",
      "index": true
    },
    "sex":{
      "type": "keyword",
      "index": false
    },
    "tel":{
      "type": "keyword",
      "index": true
    }
  }
}

数据

分词查询(type=text)

关键字查询 （type=keyword）

未被索引，不允许查询

总结

type=text ，index=true 时，可分词可查询；

type=keyword ，index=true 时，不可分词可查询；

index=false 时，不可查询

Java API

Maven

复制代码 
 <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>7.8.0</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.8.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.17.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.17.2</version>
        </dependency>

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.18</version>
        </dependency>

客户端

复制代码 
public class ElasticSearchClient {

	
	/**
	 * 创建对象
	 *
	 * @param host 地址
	 * @param port 端口
	 */
	public static RestHighLevelClient getElasticSearchClient() {
		String host="127.0.0.1";
		int port=9200;
		String scheme="http";
		return new RestHighLevelClient(
				RestClient.builder(new HttpHost(host, port,scheme)));
	}
	
	/**
	 * 关闭
	 *
	 * @param client 客户端对象
	 */
	public static void closeClient(RestHighLevelClient client) {
		try {
			client.close();
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

创建索引

复制代码 
	/**

	 * 创建索引
	 *
	 * @param index 索引名
     * RestHighLevelClient restHighLevelClient = ElasticSearchClient.getElasticSearchClient();
	 */
	public static void createIndex(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			CreateIndexRequest request = new CreateIndexRequest(index);
			CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
			boolean acknowledged = createIndexResponse.isAcknowledged();
			System.out.println("索引操作：" + acknowledged);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

​​​测试

查询索引

复制代码 
	/**
	 * 查询索引
	 *
	 * @param index 索引名
	 */
	public static void findIndex(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			GetIndexRequest request = new GetIndexRequest(index);
			GetIndexResponse getIndexResponse = restHighLevelClient.indices().get(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(getIndexResponse.getAliases());
			System.out.println(getIndexResponse.getMappings());
			System.out.println(getIndexResponse.getSettings());
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

删除索引

复制代码 
/**
	 * 删除索引
	 *
	 * @param index 索引名
	 */
	public static void deleteIndex(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			DeleteIndexRequest request = new DeleteIndexRequest(index);
			AcknowledgedResponse response = restHighLevelClient.indices().delete(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.isAcknowledged());
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

文档

创建文档

复制代码 
/**
	 * 创建文档
	 *
	 * @param index  索引
	 * @param id     id
	 * @param source Json对象
	 */
	public static void addDoc(RestHighLevelClient restHighLevelClient, String index, String id, Object source) {
		try {
			//创建索引
			IndexRequest indexRequest = new IndexRequest();
			indexRequest.index(index).id(id);
			
			indexRequest.source(JSONUtil.toJsonPrettyStr(source), XContentType.JSON);
			IndexResponse indexResponse = restHighLevelClient.index(indexRequest, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(indexResponse.status());
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

修改文档

复制代码 
	/**
	 * 修改数据
	 *
	 * @param index  索引
	 * @param id     id
	 * @param source Json对象
	 */
	public static void updateDoc(RestHighLevelClient restHighLevelClient, String index, String id, Map<String, Object> source) {
		try {
			//创建索引
			UpdateRequest request = new UpdateRequest();
			request.index(index).id(id);
			request.doc(source, XContentType.JSON);
			UpdateResponse response = restHighLevelClient.update(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.status());
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

查询文档

复制代码 
/**
	 * 查询数据
	 *
	 * @param index  索引
	 * @param id     id
	 */
	public static void findDoc(RestHighLevelClient restHighLevelClient, String index, String id) {
		try {
			//创建索引
			GetRequest request = new GetRequest();
			request.index(index).id(id);
			GetResponse getResponse = restHighLevelClient.get(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(getResponse.getSourceAsString());
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

删除文档

复制代码 
	/**
	 * 查询数据
	 *
	 * @param index  索引
	 * @param id     id
	 */
	public static void delDoc(RestHighLevelClient restHighLevelClient, String index, String id) {
		try {
			//创建索引
			DeleteRequest request = new DeleteRequest();
			request.index(index).id(id);
			DeleteResponse response = restHighLevelClient.delete(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getResult());
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

批量文档

创建文档

复制代码 
/**
	 * 创建文档
	 *
	 * @param index   索引
	 * @param id      id
	 * @param sources 数组
	 */
public static void addDoc(RestHighLevelClient restHighLevelClient, String index, List<String> ids, List<Object> sources) {
		try {
			//创建索引
			BulkRequest request = new BulkRequest();
			int size = Math.min(ids.size(), sources.size());
			for (int i = 0; i < size; i++) {
				request.add(new IndexRequest().index(index).id(ids.get(i)).source(JSONUtil.toJsonPrettyStr(sources.get(i)), XContentType.JSON));
				
			}
			
			BulkResponse bulk = restHighLevelClient.bulk(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(bulk.status());
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

删除文档

复制代码 
/**
	 * 删除数据
	 *
	 * @param index 索引
	 * @param ids    id
	 */
	public static void delDoc(RestHighLevelClient restHighLevelClient, String index, List<String> ids) {
		try {
			//创建索引
			BulkRequest request = new BulkRequest();
			for (String id : ids) {
				request.add(new DeleteRequest().index(index).id(id));
			}
			BulkResponse bulk = restHighLevelClient.bulk(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(bulk.status());
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

高级查询

全量查询

复制代码 
/**
	 * 全量查询
	 *
	 * @param index 索引
	 */
	public static void completeSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (SearchHit hit : response.getHits().getHits()) {
				System.out.println(hit.getSourceAsString());
			}
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

条件查询

复制代码 
/**
	 * 条件查询
	 *
	 * @param index 索引
	 */
	public static void pageSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder().query(QueryBuilders.termQuery("age", "16"));
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (SearchHit hit : response.getHits().getHits()) {
				System.out.println(hit.getSourceAsString());
			}
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

分页查询

复制代码 
/**
	 * 分页查询
	 *
	 * @param index 索引
	 */
	public static void pageSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
			searchSourceBuilder.from(0);
			searchSourceBuilder.size(5);
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (SearchHit hit : response.getHits().getHits()) {
				System.out.println(hit.getSourceAsString());
			}
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

排序查询

复制代码 
	/**
	 * 排序查询
	 *
	 * @param index 索引
	 */
	public static void sortSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
			searchSourceBuilder.from(0);
			searchSourceBuilder.size(4);
			searchSourceBuilder.sort("age", SortOrder.DESC);
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (SearchHit hit : response.getHits().getHits()) {
				System.out.println(hit.getSourceAsString());
			}
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

返回属性查询

复制代码 
/**
	 * 过滤查询
	 *
	 * @param index 索引
	 */
	public static void filterSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
			// 过滤
			String[] includes = {"name"};
			String[] excludes = {};
			searchSourceBuilder.fetchSource(includes, excludes);
			// 分页
			searchSourceBuilder.from(0);
			searchSourceBuilder.size(4);
			// 排序
			searchSourceBuilder.sort("age", SortOrder.DESC);
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (SearchHit hit : response.getHits().getHits()) {
				System.out.println(hit.getSourceAsString());
			}
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

组合查询

复制代码 
/**
	 * 组合查询
	 *
	 * @param index 索引
	 */
	public static void combinationSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
			BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
//			boolQueryBuilder.must(QueryBuilders.matchQuery("age","19"));
//			boolQueryBuilder.must(QueryBuilders.matchQuery("name","lisi"));
//			boolQueryBuilder.mustNot(QueryBuilders.matchQuery("sex","女"));
			boolQueryBuilder.should(QueryBuilders.matchQuery("age","19"));
			boolQueryBuilder.should(QueryBuilders.matchQuery("age","20"));
			searchSourceBuilder.query(boolQueryBuilder);
			// 过滤
			String[] includes = {"name","age"};
			String[] excludes = {};
			searchSourceBuilder.fetchSource(includes, excludes);
			// 分页
			searchSourceBuilder.from(0);
			searchSourceBuilder.size(4);
			// 排序
			searchSourceBuilder.sort("age", SortOrder.DESC);
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (SearchHit hit : response.getHits().getHits()) {
				System.out.println(hit.getSourceAsString());
			}
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

范围查询

复制代码 
/**
	 * 范围查询
	 *
	 * @param index 索引
	 */
	public static void rangeSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
			BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
			RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("age").gt(16).lt(28);
			boolQueryBuilder.filter(rangeQueryBuilder);
			searchSourceBuilder.query(boolQueryBuilder);
			// 过滤
			String[] includes = {"name","age"};
			String[] excludes = {};
			searchSourceBuilder.fetchSource(includes, excludes);
			// 分页
			searchSourceBuilder.from(0);
			searchSourceBuilder.size(2);
			// 排序
			searchSourceBuilder.sort("age", SortOrder.DESC);
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (SearchHit hit : response.getHits().getHits()) {
				System.out.println(hit.getSourceAsString());
			}
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

模糊查询

复制代码 
/**
	 * 模糊查询
	 *
	 * @param index 索引
	 */
	public static void vagueSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
			// 模糊条件
			
			searchSourceBuilder.query(QueryBuilders.fuzzyQuery("name","wangwu").fuzziness(Fuzziness.TWO));
			// 过滤
			String[] includes = {"name","age"};
			String[] excludes = {};
			searchSourceBuilder.fetchSource(includes, excludes);
			// 分页
			searchSourceBuilder.from(0);
			searchSourceBuilder.size(2);
			// 排序
			searchSourceBuilder.sort("age", SortOrder.DESC);
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (SearchHit hit : response.getHits().getHits()) {
				System.out.println(hit.getSourceAsString());
			}
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

高亮查询

复制代码 
/**
	 * 高亮查询
	 *
	 * @param index 索引
	 */
	public static void highSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
			// 模糊条件
			TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("name", "wangwu");
			
			HighlightBuilder highlightBuilder=new HighlightBuilder();
			highlightBuilder.preTags("<font color='red'>").postTags("</font>").field("name");
			searchSourceBuilder.highlighter(highlightBuilder);
			searchSourceBuilder.query(termQueryBuilder);
			// 过滤
//			String[] includes = {"name","age"};
//			String[] excludes = {};
//			searchSourceBuilder.fetchSource(includes, excludes);
			// 分页
			searchSourceBuilder.from(0);
			searchSourceBuilder.size(2);
			// 排序
			searchSourceBuilder.sort("age", SortOrder.DESC);
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (SearchHit hit : response.getHits().getHits()) {
				System.out.println(hit);
			}
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

聚合查询

复制代码 
	/**
	 * 聚合查询
	 *
	 * @param index 索引
	 */
	public static void polymerizationSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
			MaxAggregationBuilder maxAggregationBuilder = AggregationBuilders.max("MaxAge").field("age");
			searchSourceBuilder.aggregation(maxAggregationBuilder);
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (Aggregation aggregation : response.getAggregations()) {
				System.out.println(JSONUtil.toJsonPrettyStr(aggregation));
			}
			
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

分组查询

复制代码 
/**
	 * 分组查询
	 *
	 * @param index 索引
	 */
	public static void groupSearch(RestHighLevelClient restHighLevelClient, String index) {
		try {
			//创建索引
			SearchRequest request = new SearchRequest();
			request.indices(index);
			SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
			TermsAggregationBuilder termsAggregationBuilder = AggregationBuilders.terms("ageGroup").field("age");
			searchSourceBuilder.aggregation(termsAggregationBuilder);
			request.source(searchSourceBuilder);
			SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
			System.out.println("------------------------------------------------");
			System.out.println(response.getHits().getTotalHits());
			for (Aggregation aggregation : response.getAggregations()) {
				System.out.println(JSONUtil.toJsonPrettyStr(aggregation));
			}
			
			System.out.println("------------------------------------------------");
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

测试

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