SpringBoot 整合 ES 进行各种高级查询搜索

你的名字 2024-03-22 18:18 85阅读 0赞

### 数据准备 ###

因为本文都是数据的搜索，所以我们需要在我们的es服务器里先插入一些数据以供我们后面使用

esUserService

public interface EsUserService extends ElasticsearchRepository<User, Integer> {
        
    
    }

@RestController
    public class EsController {
        
        @Autowired
        private ElasticsearchRestTemplate elasticsearchTemplate;
        @Autowired
        private EsUserService esUserService;
        @Autowired
        private RestHighLevelClient client;
    
        private String[] names = {
        "诸葛亮", "曹操", "李白", "韩信", "赵云", "小乔", "狄仁杰", "李四", "诸小明", "王五"};
        private String[] infos = {
        "我来自中国的一个小乡村，地处湖南省", "我来自中国的一个大城市，名叫上海，人们称作魔都"
                , "我来自杭州，这是一个浪漫的城市"};
    
        /**
         * 准备数据
         *
         * @return
         */
        @GetMapping("prepareDate")
        public Object saveUser() {
        
            //添加索引mapping索引会自动创建但mapping自只用默认的这会导致分词器不生效 所以这里我们手动导入mapping
            Random random = new Random();
            List<User> users = new ArrayList<>();
            for (int i = 0; i < 20; i++) {
        
                User user = new User();
                user.setId(i);
                user.setName(names[random.nextInt(9)]);
                user.setAge(random.nextInt(40) + i);
                user.setInfo(infos[random.nextInt(2)]);
                users.add(user);
            }
            Iterable<User> users1 = esUserService.saveAll(users);
    
            return users1;
        }
    }

![在这里插入图片描述][26db637f80f24b67b426453db496e717.png]  
下面开始我们本文的重点

### 准备map转实体类 ###

由于我们需要频繁的使用map转对象，所以给大家一个比较好用的map转对象方法

import java.beans.BeanInfo;
    import java.beans.Introspector;
    import java.beans.PropertyDescriptor;
    import java.math.BigDecimal;
    import java.sql.ResultSet;
    import java.util.Map;
    import java.util.Objects;
    
    /**
     * 利用反射讲数据转化为Object
     *
     * @param <T>
     */
    public class BeanHandler<T> {
        
        private Class<T> clazz;
    
        public BeanHandler(Class<T> clazz) {
        
            this.clazz = clazz;
        }
    
        /**
         * 讲sql 查询结果 ResultSet转化为对象
         *
         * @param rs
         * @return
         * @throws Exception
         */
        public T handle(ResultSet rs) throws Exception {
        
            //结果集默认指向为第一个数据的前一个
            if (rs.next()) {
        
                //根据传入的字节码创建传入的指定对象
                T obj = clazz.newInstance();
                //获取指定字节码信息
                BeanInfo beanInfo = Introspector.getBeanInfo(clazz, Object.class);
                //获取所有属性描述器
                PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
                for (PropertyDescriptor pd : pds) {
        
                    //获取结果集中对应字段名的值
                    Object o = rs.getObject(pd.getName());
                    //执行当前方法并传入参数
                    pd.getWriteMethod().invoke(obj, o);
                }
                return obj;
            }
            return null;
        }
    
        /**
         * 将map 利用反射转化为对象
         *
         * @param map
         * @return
         * @throws Exception
         */
        public T handle(Map<String, Object> map) throws Exception {
        
            //结果集默认指向为第一个数据的前一个
            //根据传入的字节码创建传入的指定对象
            T obj = clazz.newInstance();
            BeanInfo beanInfo = Introspector.getBeanInfo(clazz, Object.class);
            PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
    
            for (PropertyDescriptor pd : pds) {
        
                Object o = map.get(pd.getName());
                if (Objects.nonNull(o)) {
        
                    // ！！！这里需要对属性类型做强制类型转化，
                    o = getPropertyTypeObject(pd, o);
                    // 下面的方法相当于属性的 set方法
                    pd.getWriteMethod().invoke(obj, o);
                }
            }
            return obj;
        }
    
    
        /**
         * 将对应的mapValue 强转为实体类对应的类型
         *
         * @param pd
         * @param o
         * @return
         */
        public Object getPropertyTypeObject(PropertyDescriptor pd, Object o) {
        
            //当前属性的类型
            String name = pd.getPropertyType().getName();
            name = name.substring(name.lastIndexOf(".") + 1);
            switch (name) {
        
                case "String":
                    o = String.valueOf(o);
                    break;
                case "Long":
                    o = Long.valueOf(String.valueOf(o));
                    break;
                case "Double":
                    o = Double.valueOf(String.valueOf(o));
                    break;
                case "Integer":
                    o = Integer.valueOf(String.valueOf(o));
                    break;
                case "BigDecimal":
                    o = new BigDecimal(String.valueOf(o));
                    break;
            }
            return o;
        }
    
    }

### 单条件精确查询 ###

@PostMapping("singleConditionPreciseQuery")
    public Object singleConditionPreciseQuery(@RequestParam(value = "query") String query) throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.matchQuery("name", query));
    
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }

### 范围查询 ###

/**
     * 范围查询
     * 包括from、to
     *
     * @return
     */
    @PostMapping("rangeSearch1")
    public Object rangeSearch1(@RequestParam(value = "from") int from, @RequestParam(value = "to") int to) throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.rangeQuery("age").from(from).to(to));
    
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 解析查询结果
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }
    
    /**
     * 范围查询
     * 不包括from、to
     *
     * @return
     */
    @PostMapping("rangeSearch2")
    public Object rangeSearch2(@RequestParam(value = "from") int from, @RequestParam(value = "to") int to) throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.rangeQuery("age").from(from, false).to(to, false));
    
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 解析查询结果
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }
    
    /**
     * 范围查询
     * lt:小于，gt:大于
     *
     * @return
     */
    @PostMapping("rangeSearch3")
    public Object rangeSearch3(@RequestParam(value = "from") int from, @RequestParam(value = "to") int to) throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.rangeQuery("age").lt(to).gt(from));
    
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 解析查询结果
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }

![在这里插入图片描述][37957bff403a4520b9dc7d2b56b762a2.png]

### 模糊查询，支持通配符 ###

/**
     * 模糊查询，支持通配符
     *
     * @return
     */
    @PostMapping("vagueSearch")
    public Object vagueSearch(@RequestParam(value = "query") String query) throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.wildcardQuery("name", query));
    
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }
    
    /**
     * 不使用通配符的模糊查询，左右匹配
     *
     * @return
     */
    @PostMapping("vagueSearch1")
    public Object vagueSearch1(@RequestParam(value = "query") String query) throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.queryStringQuery(query).field("name"));
    
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }
    /**
     * 多字段模糊查询
     *
     * @return
     */
    @PostMapping("vagueSearch2")
    public Object vagueSearch2(@RequestParam(value = "query") String query) throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.multiMatchQuery(query, "name", "info"));
    
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }

### 排序 ###

/**
     * 排序
     *
     * @return
     */
    @PostMapping("sortSearch")
    public Object sortSearch(@RequestParam(value = "query") String query) throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.multiMatchQuery(query, "name", "info"))
    			.sort("age", SortOrder.ASC);//按照年龄正序
    
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }

### 精确统计筛选文档数 ###

/**
     * 精确统计筛选文档数,查询性能有所降低
     *
     * @return
     */
    @PostMapping("countSearch")
    public Object countSearch() throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.trackTotalHits(true);
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 解析查询结果
    	return response;
    }

### 设置源字段过滤返回 ###

/**
     * 设置源字段过虑,第一个参数结果集包括哪些字段，第二个参数表示结果集不包括哪些字段
     *  * @return
     */
    @PostMapping("filterSearch")
    public Object filterSearch() throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.fetchSource(new String[]{
        "name", "age"}, new String[]{
        "id", "info"});
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }

![在这里插入图片描述][058003bf6f6d4fe9847d25d89251fbf9.png]

通过上图的结果我们也可以看出：

*  第一个参数结果集包括哪些字段
 *  第二个参数表示结果集不包括哪些字段

![在这里插入图片描述][273eb7c9b16a41259dd926265f38eeed.png]

### 根据 id 精确匹配 ###

/**
     * 根据Id精准查询
     *
     * @return
     */
    @PostMapping("searchByIds")
    public Object searchByIds(@RequestBody Map<String, Object> params) throws Exception {
        
    	List<Integer> ids = (List<Integer>) params.get("ids");
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.termsQuery("_id", ids));
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }

### matchAllQuery 搜索全部 ###

/**
     * matchAllQuery 搜索全部
     *
     * @return
     */
    @PostMapping("martchAllQuery")
    public Object martchAllQuery() throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.matchAllQuery());
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }

### match 搜索匹配 ###

### bool组合查询 ###

/**
    * match 搜索匹配
    *
    * @return
    */
    @PostMapping("martch")
    public Object martch(@RequestBody Map<String, Object> params) throws Exception {
        
    List<String> querys = (List<String>) params.get("querys");
    // 创建请求
    SearchSourceBuilder builder = new SearchSourceBuilder()
    		.query(QueryBuilders.matchQuery("name", querys));
    //搜索
    SearchRequest searchRequest = new SearchRequest();
    searchRequest.indices("user");
    searchRequest.types("_doc");    /**
     * bool组合查询
     *
     * @return
     */
    @PostMapping("boolSearch")
    public Object boolSearch(@RequestBody Map<String, Object> params) throws Exception {
        
    	List<String> queryNames = (List<String>) params.get("names");
    	int maxAge = (int) params.get("maxAge");
    	int minAge = (int) params.get("minAge");
    
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder();
    	BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();
    	boolQueryBuilder.must(QueryBuilders.termsQuery("name", queryNames));
    	boolQueryBuilder.must(QueryBuilders.rangeQuery("age").lte(maxAge).gte(minAge));
    	builder.query(boolQueryBuilder);
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }
    
    searchRequest.source(builder);
    // 执行请求
    SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    // 执行请求
    List<User> users = new ArrayList<>();
    for (SearchHit searchHit : response.getHits().getHits()) {
        
    	Map<String, Object> map = searchHit.getSourceAsMap();
    	BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    	User user = beanHandler.handle(map);
    	users.add(user);
    }
    // 解析查询结果
    return users;
    }

![在这里插入图片描述][420d68706c6d49ecbb81dbe6e1b81781.png]

### nested类型嵌套查询 ###

有时候，我们需要查询一个`对象内部类`的值，发现通过平时的查询查询不到数据，这时DSL(Domain Specific language,即特定领域专用语言)出场了！

elasticsearch中的内部对象无法按预期工作，这里的问题是elasticsearch（lucene）使用的库没有内部对象的概念，因此内部对象被扁平化为一个简单的字段名称和值列表。

/**
     * nested类型嵌套查询
     *
     * @return
     */
    @PostMapping("nestedSearch")
    public Object nestedSearch() throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder();
    	//条件查询
    	BoolQueryBuilder mainBool=new BoolQueryBuilder();
    	mainBool.must(QueryBuilders.matchQuery("name", "赵六"));
    	//nested类型嵌套查询
    	BoolQueryBuilder boolQueryBuilder=new BoolQueryBuilder();
    	boolQueryBuilder.must(QueryBuilders.matchQuery("user.name", "A"));
    	boolQueryBuilder.must(QueryBuilders.matchQuery("user.info", "浦东"));
    	NestedQueryBuilder nested = QueryBuilders.nestedQuery("user",boolQueryBuilder, ScoreMode.None);
    	mainBool.must(nested);
    	builder.query(mainBool);
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }

### 多条件查询 + 排序 + 分页 ###

/**
     * 多条件查询 + 排序 + 分页
     *
     * @return
     */
    @PostMapping("multiConditionSearch")
    public Object multiConditionSearch() throws Exception {
        
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder();
    	//条件搜索
    	BoolQueryBuilder boolQueryBuilder=new BoolQueryBuilder();
    	boolQueryBuilder.must(QueryBuilders.matchQuery
    	("name", "张").operator(Operator.AND);//需要 满足所有字段);
    	boolQueryBuilder.must(QueryBuilders.rangeQuery("age").lte(30).gte(20));
    	builder.query(boolQueryBuilder);
    	//结果集合分页
    	builder.from(0).size(2);
    
    	//排序
    	builder.sort("age",SortOrder.ASC);
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 执行请求
    	List<User> users = new ArrayList<>();
    	for (SearchHit searchHit : response.getHits().getHits()) {
        
    		Map<String, Object> map = searchHit.getSourceAsMap();
    		BeanHandler<User> beanHandler = new BeanHandler<>(User.class);
    		User user = beanHandler.handle(map);
    		users.add(user);
    	}
    	// 解析查询结果
    	return users;
    }

### 聚合查询 ###

/**
     * 求和
     *
     * @return
     */
    @PostMapping("sumSearch")
    public Object sumSearch() throws Exception {
        
    	Map<String, Object> result = new HashMap<>();
    	// 创建请求
    	SearchSourceBuilder builder = new SearchSourceBuilder()
    			.query(QueryBuilders.termsQuery("_id", new int[]{
        1, 2, 3}));
    	//条件搜索
    	//结果集合分页
    	builder.from(0).size(2);
    	builder.query(QueryBuilders.matchAllQuery());
    	//聚合查询
    	AggregationBuilder aggregation = AggregationBuilders.sum("sum_age").field("age");
    	builder.aggregation(aggregation);
    
    	//搜索
    	SearchRequest searchRequest = new SearchRequest();
    	searchRequest.indices("user");
    	searchRequest.types("_doc");
    	searchRequest.source(builder);
    	// 执行请求
    	SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);
    	// 解析查询结果
    	return response;
    }

![在这里插入图片描述][ff8e9846ba49460cbbc4f66b981b7c02.png]  
![在这里插入图片描述][5a1392d30ba24b65861cb3988bb60bc1.png]

值得我们注意的是在进行聚合操作的fild上，如果我们该字段设置成key或者text，则会出现以下错误

![在这里插入图片描述][a91fa3a9640a4d1ba7179a639aadc88f.png]  
原因是：

> 文本字段未针对需要每个文档字段数据（如聚合和排序）的操作进行优化，因此默认情况下禁用这些操作。

> 我们需要改用关键字字段。或者，在设置了text或者key的字段上设置fielddata=true，以便通过取消反转索引来加载字段数据。`请注意，这可能会占用大量内存`

参考文章并稍作修改，[https://blog.csdn.net/zhiyikeji/article/details/128939901][https_blog.csdn.net_zhiyikeji_article_details_128939901]

[26db637f80f24b67b426453db496e717.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/bbab8e582f0c44f492cf6e652abaa5aa.png
[37957bff403a4520b9dc7d2b56b762a2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/9b634c7d2e2446c5bdf1a37a1eb1af97.png
[058003bf6f6d4fe9847d25d89251fbf9.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/153b3920cde44f6781e6776367347e72.png
[273eb7c9b16a41259dd926265f38eeed.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/015c4a57bc404aa68ef581f3737b8a30.png
[420d68706c6d49ecbb81dbe6e1b81781.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/c6c22aa521174738af08c5b62d5c56c7.png
[ff8e9846ba49460cbbc4f66b981b7c02.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/57b16663921e40d2b79c790df15e63cb.png
[5a1392d30ba24b65861cb3988bb60bc1.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/e17529dfadd34a41962b7c04997104a5.png
[a91fa3a9640a4d1ba7179a639aadc88f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/18/16950926302449d3b0be0f205e2e8a9c.png
[https_blog.csdn.net_zhiyikeji_article_details_128939901]: https://blog.csdn.net/zhiyikeji/article/details/128939901