Elasticsearch入门到实战（一）

怼烎@ 2023-10-04 15:01 43阅读 0赞

**目录**

概述

1.安装Elasticsearch，从官网下载windwins版本的包，解压开箱即用

2.使用javaApi连接es

3.创建索引

4.获取索引记录

5.删除索引

6.向索引中添加doc

7.更新doc的某个值

8.查询doc文档

9.删除doc文档

10.批量添加doc

11.批量删除doc

12.批量更新doc

13.使用query查询索引下的所有doc

14.使用query带条件查询某个索引下的doc

15.使用query带分页查询某个索引下的doc

16.使用query带排序查询某个索引下的doc

17.使用query查询某个索引下的doc-查询某些字段

18.使用query查询某个索引下的doc-组合条件查询（and的关系）

19.使用query查询某个索引下的doc-组合条件查询（or的关系）

20.使用query查询某个索引下的doc-按范围查询

21.使用query查询某个索引下的doc-模糊查询

22.使用query查询某个索引下的doc-高亮显示某个字段

23.使用query查询某个索引下的doc-聚合查询（某个字段最大最小）

24.使用query查询某个索引下的doc-分组查询

25.集群部署elasticsearch简介

26.windows环境下elasticsearch集群部署

--------------------

#### 概述 ####

Elasticsearch 是一个分布式、RESTful 风格的搜索和数据分析引擎，能够解决不断涌现出的各种用例。 作为 Elastic Stack 的核心，它集中存储您的数据，帮助您发现意料之中以及意料之外的情况。Elasticsearch是java开发的，在7.8版本以上，需要使用jdk1.8以上版本。

官网访问地址：[Download Elasticsearch | Elastic][Download Elasticsearch _ Elastic]

Elasticsearch是面向文档型数据库，一条数据在这里就是一个文档。为了方便大家理解，我们将Elasticsearch里存储文档数据与关系型数据库mysql存储数据的概念进行类比

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70][]

ES里的Index可以看做一个库，而type相当于表，Documents相当于行。

这里type的概念逐渐被弱化，Elasticsearch 6.x中，一个index下只能包含一个type，Elasticsearch 7.x中，type的概念已经被删除了。

#### **1.安装Elasticsearch，从官网下载windwins版本的包，解压开箱即用** ####

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 1][]

目录说明

bin:程序启动的bat文件

config:配置信息

data:存放数据

jdk:自带的jdk

lib：需要的jar包

logs：日志文件

modules：功能模块

plugins：扩展功能包

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 2][]

点击bin目录下的elasticsearch.bat文件，启动elasticsearch项目，默认系统访问端口9200

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 3][]

使用[http://127.0.0.1:9200/][http_127.0.0.1_9200]访问，看到以下页面，说明启动成功

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 4][]

#### **2.使用javaApi连接es** ####

(1)新建maven项目后，pom.xml导入需要的包

<dependencies>
            <dependency>
                <groupId>org.elasticsearch</groupId>
                <artifactId>elasticsearch</artifactId>
                <version>7.13.0</version>
            </dependency>
    
            
            <dependency>
                <groupId>org.elasticsearch.client</groupId>
                <artifactId>elasticsearch-rest-high-level-client</artifactId>
                <version>7.12.0</version>
            </dependency>
    
            
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-api</artifactId>
                <version>2.8.2</version>
            </dependency>
            <dependency>
                <groupId>org.apache.logging.log4j</groupId>
                <artifactId>log4j-core</artifactId>
                <version>2.8.2</version>
            </dependency>
    
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>2.12.3</version>
            </dependency>
    
            
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>
        </dependencies>

（2）使用RestHighLevelClient创建客户端连接测试

public class EsClientTest {
    
        @Test
        public void testConneEs() throws IOException {
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.关闭连接
            restHighLevelClient.close();
        }
    }

#### **3.创建索引** ####

public class EsCreateIndex {
    
        @Test
        public void createIndex() throws IOException {
    
            //1.创建客户端连接
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建索引请求
            CreateIndexRequest createIndexRequest = new CreateIndexRequest("user");
            //3.得到创建索引回调
            CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(createIndexRequest, RequestOptions.DEFAULT);
    
            //4.获取响应状态
            boolean acknowledged = createIndexResponse.isAcknowledged();
            System.out.println("创建索引的响应结果："+acknowledged);
    
            //5.关闭资源
            restHighLevelClient.close();
        }
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 5][]

通过网页访问索引

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 6][]

#### **4.获取索引记录** ####

@Test
        public void searchIndex() throws IOException {
            //1.创建连接es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.封装请求索引的参数
            GetIndexRequest getIndexRequest = new GetIndexRequest("user");
    
            //3.根据参数获取索引返回值
            GetIndexResponse getIndexResponse = restHighLevelClient.indices().get(getIndexRequest, RequestOptions.DEFAULT);
    
            //4.查看返回值情况
            System.out.println(getIndexResponse.getAliases());
            System.out.println(getIndexResponse.getMappings());
            System.out.println(getIndexResponse.getSettings());
    
            //5.关闭资源
            restHighLevelClient.close();
    
        }

控制台获取情况

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 7][]

#### **5.删除索引** ####

@Test
        public void deleteIndex() throws IOException {
            //1.获取es客户端连接
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建需要删除的索引
            DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest("user");
    
            //3.执行删除索引
            AcknowledgedResponse acknowledgedResponse = restHighLevelClient.indices().delete(deleteIndexRequest, RequestOptions.DEFAULT);
    
            //4.输出执行结果
            System.out.println("执行删除结果："+acknowledgedResponse.isAcknowledged());
            //5，关闭客户端
            restHighLevelClient.close();
    
    
    
        }

#### **6.向索引中添加doc** ####

@Test
        public void docInsert() throws IOException {
            //1.创建es客户端链接
    
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建操作的索引请求
            IndexRequest indexRequest = new IndexRequest();
    
            //3.设置向索引中添加的doc先关信息
            //3.1指定向那个缩影中添加文档，可以指定id
            indexRequest.index("user").id("1001");
    
            //3.2创建实体并给字段赋值
            User user = new User();
            user.setName("张三");
            user.setAge(30);
            user.setPassword("123456");
    
            //3.3把实体转成json格式
            ObjectMapper objectMapper = new ObjectMapper();
            String s = objectMapper.writeValueAsString(user);
    
    
            //3.4设置请求的doc资源
            indexRequest.source(s, XContentType.JSON);
            //4.执行添加doc的操作
            IndexResponse indexResponse = restHighLevelClient.index(indexRequest, RequestOptions.DEFAULT);
    
            System.out.println("执行结果："+indexResponse.getResult());
            //5.关闭资源
            restHighLevelClient.close();
    
    
    
        }

使用postman查看当前添加的doc文档情况

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 8][]

#### **7.更新doc的某个值** ####

@Test
        public void docUpdate() throws IOException {
            //1.创建es客户端链接
    
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建更新操作的索引请求
            UpdateRequest updateRequest = new UpdateRequest();
    
            //3指定操作哪个索引，使用id指定是哪个doc
            updateRequest.index("user").id("1001");
    
            //4.设置需要修改的doc
            updateRequest.doc(XContentType.JSON,"name","李四");
    
            //5.执行修改doc的操作
            UpdateResponse response = restHighLevelClient.update(updateRequest, RequestOptions.DEFAULT);
    
    
            System.out.println("执行结果："+response.getResult());
            //5.关闭资源
            restHighLevelClient.close();
    
    
    
        }

name字段值有张三更新为李四

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 9][]

#### **8.查询doc文档** ####

@Test
        public void docSelect() throws IOException {
            //1.创建es客户端连接
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                 RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询doc数据
            GetRequest getRequest = new GetRequest();
            getRequest.index("user").id("1001");
    
            //3.执行查询
            GetResponse documentFields = restHighLevelClient.get(getRequest, RequestOptions.DEFAULT);
    
            System.out.println(documentFields.getSourceAsString());
            //4.关闭资源
            restHighLevelClient.close();
    
        }

控制台输出结果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 10][]

#### **9.删除doc文档** ####

@Test
        public void docDelete() throws IOException {
            //1.创建es客户端连接
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建删除的doc数据请求
            DeleteRequest deleteRequest = new DeleteRequest();
            deleteRequest.index("user").id("1001");
    
            //3.执行删除
            DeleteResponse response = restHighLevelClient.delete(deleteRequest, RequestOptions.DEFAULT);
    
            System.out.println(response.toString());
            //4.关闭资源
            restHighLevelClient.close();
    
        }

控制台执行结果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 11][]

使用postman查询记录-已经删除成功

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 12][]

#### **10.批量添加doc** ####

@Test
        public void batchDocInster() throws IOException {
            //1.创建es客户端链接
    
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建批量操作的请求
            BulkRequest bulkRequest = new BulkRequest();
    
            //3.往批量请求中添加记录
            bulkRequest.add(new IndexRequest("user").id("1001").source(XContentType.JSON,"name","张三"));
            bulkRequest.add(new IndexRequest("user").id("1002").source(XContentType.JSON,"name","李四"));
            bulkRequest.add(new IndexRequest("user").id("1003").source(XContentType.JSON,"name","王五"));
    
            //4.执行批量添加请求
            BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
            System.out.println("花费的时间："+bulk.getTook());
            System.out.println("执行的项："+bulk.getItems());
    
            //5.关闭资源
            restHighLevelClient.close();
    
    
    
        }

使用postman查看user索引下的所有文档

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 13][]

#### **11.批量删除doc** ####

@Test
        public void batchDocDelete() throws IOException {
            //1.创建es客户端链接
    
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建批量操作的请求
            BulkRequest bulkRequest = new BulkRequest();
    
            //3.往批量请求中添加删除的记录
            bulkRequest.add(new DeleteRequest("user").id("1001"));
            bulkRequest.add(new DeleteRequest("user").id("1002"));
            bulkRequest.add(new DeleteRequest("user").id("1003"));
    
            //4.执行批量添加请求
            BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
            System.out.println("花费的时间："+bulk.getTook());
            System.out.println("执行的项："+bulk.getItems());
    
            //5.关闭资源
            restHighLevelClient.close();
    
    
    
        }

使用postman查看索引下的文档

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 14][]

#### **12.批量更新doc** ####

@Test
        public void batchDocUpdate() throws IOException {
            //1.创建es客户端链接
    
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建批量操作的请求
            BulkRequest bulkRequest = new BulkRequest();
    
            //3.往批量请求中添加记录
            bulkRequest.add(new UpdateRequest().index("user").id("1001").doc(XContentType.JSON,"name","张三1"));
            bulkRequest.add(new UpdateRequest().index("user").id("1002").doc(XContentType.JSON,"name","李四1"));
            bulkRequest.add(new UpdateRequest().index("user").id("1003").doc(XContentType.JSON,"name","王五1"));
    
            //4.执行批量添加请求
            BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
            System.out.println("花费的时间："+bulk.getTook());
            System.out.println("执行的项："+bulk.getItems());
    
            //5.关闭资源
            restHighLevelClient.close();
    
    
    
        }

postman中查看索引下的文档

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 15][]

#### **13.使用query查询索引下的所有doc** ####

/**
         * 查询指定索引下所有doc
         */
        @Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--查询所有的记录
            searchRequest.source(new SearchSourceBuilder().query(QueryBuilders.matchAllQuery()));
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

控制台打印消息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 16][]

#### **14.使用query带条件查询某个索引下的doc** ####

#### 15.**使用query带分页查询某个索引下的doc** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--分页查询
            SearchSourceBuilder query = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
    
            //4.1设置起始行数
            query.from(0);
    
            //4.2设置每页的大小
            query.size(2);
    
            searchRequest.source(query);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

#### 16.**使用query带排序查询某个索引下的doc** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--分页查询--排序
            SearchSourceBuilder query = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
    
            //4.1设置排序方式：升序SortOrder.ASC、降序SortOrder.DESC
            query.sort("age", SortOrder.DESC);
            searchRequest.source(query);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

#### 17.**使用query查询某个索引下的doc-查询某些字段** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--过滤查询字段
            SearchSourceBuilder query = new SearchSourceBuilder().query(QueryBuilders.matchAllQuery());
    
            //4.1设置包含哪些字段
            String [] includes = {"name","age"};
            //4.2设置去除哪些字段
            String [] excludes = {};
            query.fetchSource(includes,excludes);
    
            searchRequest.source(query);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

#### 18.**使用query查询某个索引下的doc-组合条件查询（and的关系）** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--组合条件查询
            SearchSourceBuilder builder = new SearchSourceBuilder();
    
            //4.1使用boolQuery方式
            BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
    
            //4.2设置查询条件
            boolQueryBuilder.must(QueryBuilders.matchQuery("age",30));  //must必须满足
            boolQueryBuilder.mustNot(QueryBuilders.matchQuery("name","lisi"));//mustNot必须不满足
    
            //4.3给查询资源设置值
            builder.query(boolQueryBuilder);
    
            searchRequest.source(builder);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

#### 19.**使用query查询某个索引下的doc-组合条件查询（or的关系）** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--组合条件查询
            SearchSourceBuilder builder = new SearchSourceBuilder();
    
            //4.1使用boolQuery方式
            BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
    
            //4.2设置查询条件
            boolQueryBuilder.should(QueryBuilders.matchQuery("age",30));  //should应该满足
            boolQueryBuilder.should(QueryBuilders.matchQuery("age",90));//should应该满足
    
            //4.3给查询资源设置值
            builder.query(boolQueryBuilder);
    
            searchRequest.source(builder);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

#### 20.**使用query查询某个索引下的doc-按范围查询** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--范围查询
            SearchSourceBuilder builder = new SearchSourceBuilder();
    
            //4.1使用rangeQuery--指定按哪个字段范围查询
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("age");
    
            //4.2设置范围  gte:大于等于 gt：大于  lte：小于等于 lt:小于
            rangeQuery.gte(30);
            rangeQuery.lt(90);
    
            //4.3给查询资源设置值
            builder.query(rangeQuery);
    
            searchRequest.source(builder);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

#### 21.**使用query查询某个索引下的doc-模糊查询** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--模糊查询
            SearchSourceBuilder builder = new SearchSourceBuilder();
    
            //4.1使用rangeQuery--指定按哪个字段模糊查询,Fuzziness.ONE模糊一位
            FuzzyQueryBuilder fuzziness = QueryBuilders.fuzzyQuery("name", "张三").fuzziness(Fuzziness.ONE);
    
            //4.3给查询资源设置值
            builder.query(fuzziness);
    
            searchRequest.source(builder);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

#### 22.**使用query查询某个索引下的doc-高亮显示某个字段** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--高亮显示
            SearchSourceBuilder builder = new SearchSourceBuilder();
    
            //4.1使用rangeQuery--指定按哪个字段查询
            TermsQueryBuilder termsQueryBuilder = QueryBuilders.termsQuery("age", "30");
    
            //4.2设置高亮样式
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            //4.3设置高亮的前缀
            highlightBuilder.preTags("<font color='red'>");
            //4.4设置高亮的后缀
            highlightBuilder.postTags("</font>");
            //4.4设置添加高亮的字段
            highlightBuilder.field("name");
            //4.5给查询添加高亮
            builder.highlighter(highlightBuilder);
            //4.6给查询资源设置值
            builder.query(termsQueryBuilder);
    
            searchRequest.source(builder);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

#### 23.**使用query查询某个索引下的doc-聚合查询（某个字段最大最小）** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--聚合查询
            SearchSourceBuilder builder = new SearchSourceBuilder();
    
            //4.1查询某个字段最大max、最小min
            MaxAggregationBuilder maxAggregationBuilder = AggregationBuilders.max("maxAge").field("age");
            builder.aggregation(maxAggregationBuilder);
    
            searchRequest.source(builder);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

#### 24.**使用query查询某个索引下的doc-分组查询** ####

@Test
        public void queryIndexOfAllDoc() throws IOException {
    
            //1.创建es客户端
            RestHighLevelClient restHighLevelClient = new RestHighLevelClient(
                    RestClient.builder(new HttpHost("localhost",9200,"http"))
            );
    
            //2.创建查询的请求
            SearchRequest searchRequest = new SearchRequest();
    
            //3.设置操作的索引
            searchRequest.indices("user");
    
            //4.设置请求的资源参数--分组查询
            SearchSourceBuilder builder = new SearchSourceBuilder();
    
            //4.1查询按某个字段进行分组
            TermsAggregationBuilder aggregationBuilder = AggregationBuilders.terms("ageGroup").field("age");
            builder.aggregation(aggregationBuilder);
    
            searchRequest.source(builder);
    
            //5.执行查询
            SearchResponse response = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    
            //6.对查询结果进行输出
            System.out.println("执行时间："+response.getTook());
            SearchHits hits = response.getHits();
            System.out.println("查询到的记录条数："+hits.getTotalHits());
            //遍历输出所以的记录
            for (SearchHit hit : hits){
                System.out.println(hit.getSourceAsString());
            }
    
            //7.关闭资源
            restHighLevelClient.close();
        }

####  **25.集群部署elasticsearch简介** ####

**背景**：单台elasticsearch提供服务，往往都有最大的负载能力，超过这个阈值，服务器性能就会大大降低甚至不可用，所以生成环境中，一般都是运行在指定服务器集群中。

**集群cluster**：一个集群就是由一个或者多个服务器节点组织在一起，共同持有整个数据，并一起提供索引和搜索服务。一个Elasticsearch集群有一个唯一的名字标识，整个名字默认就是elasticsearch。整个名字很重要，因为一个节点只能通过指定某个集群的名字来加入集群。

**节点Node**：集群中包含很多的服务器，一个节点就是其中的一个服务器。作为集群的一部分，它存储数据，参与集群的索引和搜索功能。一个节点也是由一个表示来决定的，一个节点可以通过配置集群名称的方式来加入一个指定的集群

#### **26.windows环境下elasticsearch集群部署** ####

（1）创建一个elasticsearch-cluster的文件件，把elasticsearch服务文件拷贝三份进去，删除data和logs目录下的文件，分别命名为node-1001、node-1002、node-1003，作为三个节点服务

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 17][]

（2）修改集群文件目录中每个节点的config/elasticsearch.yml文件

> node-1001节点配置

#集群名称，节点之间要保持一致
    cluster.name: my-application
    #节点名称，集群内要保持唯一
    node.name: node-1001
    #可以作为master节点
    node.master: true
    #存储数据
    node.data: true
    #ip地址
    network.host: localhost
    #http端口
    http.port: 1001
    #tcp监听端口，节点之间内部通信使用
    transport.tcp.port: 9301
    #节点之间相互通信的主机地址
    #discovery.seed_hosts: ["host1", "host2"]
    #discovery.zen.fd.ping_timeout:1m
    #discovery.zen.fd.ping_retries:5
    #跨域配置
    http.cors.enabled: true
    http.cors.allow-origin: "*"

此时从bin/elasticsearch.bat启动node-1001，控制服务台打印出节点名称、集群名称

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 18][]

使用postman查看节点的启动状态（启动）和节点数（1个）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 19][]

> node-1002节点配置

#集群名称，节点之间要保持一致
    cluster.name: my-application
    #节点名称，集群内要保持唯一
    node.name: node-1002
    #可以作为master节点
    node.master: true
    #存储数据
    node.data: true
    #ip地址
    network.host: localhost
    #http端口
    http.port: 1002
    #tcp监听端口，节点之间内部通信使用
    transport.tcp.port: 9302
    #节点之间相互通信的主机地址-查找主节点
    discovery.seed_hosts: ["localhost:9301"]
    #执行查找ping命令的超时时间
    discovery.zen.fd.ping_timeout: 1m
    discovery.zen.fd.ping_retries: 5
    #跨域配置
    http.cors.enabled: true
    http.cors.allow-origin: "*"

此时从bin/elasticsearch.bat启动node-1002，控制服务台打印出节点名称、集群名称

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 20][]

使用postman查看节点的启动状态（启动）和节点数（2个）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 21][]

> node-1003节点配置

#集群名称，节点之间要保持一致
    cluster.name: my-application
    #节点名称，集群内要保持唯一
    node.name: node-1003
    #可以作为master节点
    node.master: true
    #存储数据
    node.data: true
    #ip地址
    network.host: localhost
    #http端口
    http.port: 1003
    #tcp监听端口，节点之间内部通信使用
    transport.tcp.port: 9303
    #节点之间相互通信的主机地址-查找主节点
    discovery.seed_hosts: ["localhost:9301","localhost:9302"]
    #执行查找ping命令的超时时间
    discovery.zen.fd.ping_timeout: 1m
    discovery.zen.fd.ping_retries: 5
    #跨域配置
    http.cors.enabled: true
    http.cors.allow-origin: "*"

此时从bin/elasticsearch.bat启动node-1003，控制服务台打印出节点名称、集群名称

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 22][]

使用postman查看节点的启动状态（启动）和节点数（3个）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 23][]

[Download Elasticsearch _ Elastic]: https://www.elastic.co/cn/downloads/elasticsearch
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20210605211618307.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20210531214356484.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/2021053121464592.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
[http_127.0.0.1_9200]: http://127.0.0.1:9200/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20210531214747329.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20210603225459975.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20210603225718168.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 7]: https://img-blog.csdnimg.cn/20210605214121909.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 8]: https://img-blog.csdnimg.cn/20210605222822132.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
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