elasticsearch的安装及使用-初级

elasticsearch
https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html

spring
https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html

全面且权威，各类博客中的内容都可以从中找到影子，但是英文的

#查找镜像
[root@localhost ~]# docker search elasticsearch

#下载镜像
[root@localhost ~]# docker pull elasticsearch
Using default tag: latest
Error response from daemon: manifest for elasticsearch:latest not found: manifest unknown: manifest unknown

#https://hub.docker.com/search?type=image
#查找elasticsearch最新版本tags

#下载指定版本镜像
[root@localhost ~]# docker pull elasticsearch:7.14.2

#建立目录 挂载映射配置文件
mkdir -p /home/elasticsearch/config
#建立目录 挂载映射数据
mkdir -p /home/elasticsearch/data
#建立目录 挂载映射插件
mkdir -p /home/elasticsearch/plugins
#编辑配置文件
vim /home/elasticsearch/config/elasticsearch.yml
#添加配置，允许任何ip连接，es默认不开启远程连接
http.host: 0.0.0.0
transport.host: 0.0.0.0

#赋权
chmod -R 777 /home/elasticsearch/

#启动
docker run --name elasticsearch -p 9200:9200 -p 9300:9300 
-e "discovery.type=single-node" 
-e ES_JAVA_OPTS="-Xms64m -Xmx512m" 
-v /home/elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml 
-v /home/elasticsearch/data:/usr/share/elasticsearch/data 
-v /home/elasticsearch/plugins:/usr/share/elasticsearch/plugins 
-d elasticsearch:7.14.2

#查看日志
[root@localhost home]# docker logs 83a096a93868
#访问验证
http://192.168.229.200:9200/

[root@localhost ~]# docker pull mobz/elasticsearch-head:5
[root@localhost ~]# docker run --name elasticsearch-head -di -p 9100:9100 docker.io/mobz/elasticsearch-head:5

#访问验证
http://192.168.229.200:9100/
#填写es地址进行连接，一般会提示跨域：
vim elasticsearch.yml
#添加配置
http.cors.enabled: true
http.cors.allow-origin: "*"

请求es报错406：
Content-Type header [application/x-www-form-urlencoded] is not supported
需要修改配置
#进入容器
docker exec -it -u root elasticsearch-head /bin/bash
#编辑6886和7573行，将application/x-www-form-urlencoded改为application/json;charset=UTF-8
vim _site/vendor.js +6886
vim _site/vendor.js +7573

#如果没有vim的话安装：
# 先更新我们的包管理工具
apt-get update
# 然后安装我们需要的vim
apt-get install vim

[root@localhost home]# docker pull kibana:7.14.2
docker run --name kibana -e ELASTICSEARCH_HOSTS=http://192.168.229.200:9200 -p 5601:5601 -d kibana:7.14.2

#访问验证
http://192.168.229.200:5601/

es自带的有standard默认、simple、whitespace
根据es的版本下载对应的版本的ik
https://github.com/medcl/elasticsearch-analysis-ik/releases

插件目录下创建目录ik，解压下载的zip，得到：
[root@localhost ik]# pwd
/home/elasticsearch/plugins/ik
[root@localhost ik]# 
[root@localhost ik]# ls
commons-codec-1.9.jar  commons-logging-1.2.jar  config  elasticsearch-analysis-ik-7.14.2.jar  httpclient-4.5.2.jar  httpcore-4.4.4.jar  plugin-descriptor.properties  plugin-security.policy

重启es

测试
GET _analyze
{
  "analyzer": "standard",
  "text": "In 2020, Java is the best language in the world."
}

中文分词器：ik_smart、ik_max_word
GET _analyze
{
    "analyzer": "ik_smart",
    "text": "我买了一台计算机"
}

#1.报错
WARNING: IPv4 forwarding is disabled. Networking will not work
#编辑
vim /etc/sysctl.conf
#添加
net.ipv4.ip_forward=1
#重启
systemctl restart network
#验证
sysctl net.ipv4.ip_forward

依赖

	org.springframework.boot
	spring-boot-starter-data-elasticsearch

配置文件

#主要为ip及端口
elasticsearch.ip=192.168.229.200
elasticsearch.port=9200
elasticsearch.pool=10
elasticsearch.cluster.name=elasticsearch

配置类

//8开始不支持TransportClient，需使用RestHighLevelClient
@Bean
public RestHighLevelClient restHighLevelClient(){
    return new RestHighLevelClient(RestClient.builder(new HttpHost(hostName,port,"http")));
}

创建实体类备用

public class User {
    private Integer id;
    private String username;
}

//创建索引
@Test
public void testIndexData() throws IOException {
    CreateIndexRequest request = new CreateIndexRequest("es_demo_index1");
    CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);
    System.out.println(createIndexResponse.index());
    System.out.println(createIndexResponse);
}

//判断索引是否存在
@Test
public void testExistIndex () throws IOException{
    GetIndexRequest request = new GetIndexRequest("es_demo_index1");
    boolean exists = client.indices().exists(request, RequestOptions.DEFAULT);
    System.out.println(exists);
}

//删除索引
@Test
public void deleteIndex() throws IOException {
    DeleteIndexRequest request = new DeleteIndexRequest("es_demo_index1");
    AcknowledgedResponse delete = client.indices().delete(request, RequestOptions.DEFAULT);
    System.out.println("是否删除成功：" + delete.isAcknowledged());
}

//创建文档
@Test
public void createdocument() throws IOException {
    User user = new User().setId(2).setUsername("zh");
    IndexRequest request = new IndexRequest("user_index");
    //设置规则  PUT /user_index/_doc/1
    request.id("1");
    //超时时间
    request.timeout(Timevalue.timevalueSeconds(1));
    //数据放入请求中
    request.source(JSONObject.toJSonString(user), XContentType.JSON);
    IndexResponse index = client.index(request, RequestOptions.DEFAULT);

    System.out.println("创建结果：" + index);
}

//获取文档
@Test
public void getdocument() throws IOException {
    GetRequest request = new GetRequest("user_index", "1");
    boolean exists = client.exists(request, RequestOptions.DEFAULT);
    if (!exists) {
        return;
    }
    GetResponse response = client.get(request, RequestOptions.DEFAULT);
    System.out.println("文档：" + response);
    System.out.println("文档内容：" + response.getSourceAsString());
}

//更新文档
@Test
public void updatedocument() throws IOException {
    UpdateRequest request = new UpdateRequest("user_index", "1");
    User user = new User().setId(2).setUsername("bob");
    request.doc(JSONObject.toJSonString(user), XContentType.JSON);
    UpdateResponse update = client.update(request, RequestOptions.DEFAULT);
    System.out.println("更新结果：" + update);
}

//删除文档
@Test
public void deletedocument() throws IOException {
    DeleteRequest request = new DeleteRequest("user_index", "1");
    DeleteResponse delete = client.delete(request, RequestOptions.DEFAULT);
    System.out.println("删除结果：" + delete.status());
}

//批量插入
@Test
public void createBulkdocument() throws IOException {
    //构建批量插入的请求
    BulkRequest request = new BulkRequest();
    request.timeout("10s");

    //设置数据
    List list = new ArrayList<>();
    list.add(new User().setId(1).setUsername("张三"));
    list.add(new User().setId(2).setUsername("李四"));
    list.add(new User().setId(3).setUsername("王五"));
    list.add(new User().setId(4).setUsername("赵六"));

    for (int i = 0; i < list.size(); i++) {
        request.add(new IndexRequest("user_index")
                .id(String.valueOf(i + 1))
                .source(JSONObject.toJSonString(list.get(i)), XContentType.JSON));
    }

    BulkResponse bulk = client.bulk(request, RequestOptions.DEFAULT);
    System.out.println("批量插入是否有失败：" + bulk.hasFailures());
}

//查询
@Test
public void query() throws IOException {
    SearchRequest request = new SearchRequest("user_index");

    SearchSourceBuilder builder = new SearchSourceBuilder();

    //精准匹配
    TermQueryBuilder termQuery = QueryBuilders.termQuery("username.keyword", "李四");
    //全文
    MatchAllQueryBuilder matchAllQuery = QueryBuilders.matchAllQuery();
    //关键词匹配？
    WildcardQueryBuilder wildcardQuery = QueryBuilders.wildcardQuery("username", "张");

    builder.query(termQuery);
    request.source(builder);
    SearchResponse response = client.search(request, RequestOptions.DEFAULT);

    SearchHit[] hits = response.getHits().getHits();
    System.out.println("共查询到" + hits.length + "条数据");
    System.out.println("查询结果：");
    for (SearchHit hit : hits) {
        System.out.println(hit.getSourceAsString());
    }
}

报错this is not a http port
访问的是es的tcp端口9300，需换成http端口9200

更多参考spring文档
https://docs.spring.io/spring-data/elasticsearch/docs/4.1.2/reference/html/#elasticsearch.repositories

实体类备用

@Data
@document(indexName = "book")
public class Book {

    @Id
    @Field(type = FieldType.Text)
    private String id;
    @Field(analyzer="ik_max_word")
    private String title;
    @Field
    private String author;
    @Field(type = FieldType.Double)
    private Double price;
    @Field(type = FieldType.Date,format = DateFormat.basic_date_time)
    private Date createTime;
    @Field(type = FieldType.Date,format = DateFormat.basic_date_time)
    private Date updateTime;

}

创建repository，并添加两个自定义方法

public interface ESBookRepository extends ElasticsearchRepository {

    
    List findByTitleOrAuthor(String title, String author);
	
    @Highlight(fields = {
            @HighlightField(name = "title"),
            @HighlightField(name = "author")
    })
    @Query("{"match":{"title":"?0"}}")
    List find(String keyword);

}

测试

//插入、修改
@Test
void insert() {
    Book book = Book.builder().id("1").author("bob").createTime(new Date()).build();
    repository.save(book);
}

//批量插入
@Test
void insertBatch() {
    List list = new ArrayList<>();
    list.add(Book.builder().id("2").author("bob").title("bbb").createTime(new Date()).build());
    list.add(Book.builder().id("3").author("tom").title("ttt").price(200d).createTime(new Date()).build());
    list.add(Book.builder().id("4").author("lauria").title("lll").createTime(new Date()).build());
    repository.saveAll(list);
}

//查找
@Test
void find() {
    Optional optionalBook = repository.findById("4");
    Book book = optionalBook.orElse(null);
    System.out.println(book);
    System.out.println("=======================");
    // price是Double类型的
    Iterable books = repository.findAll(Sort.by(Sort.Direction.DESC, "price"));
    books.forEach(System.out::println);
}

//自定义方法
@Test
void findCustomMethod() {
    List books = repository.findByTitleOrAuthor("bbb", "bob");
    books.forEach(System.out::println);
}

层次结构对比

https://blog.csdn.net/qq_17040587/article/details/120971124
https://blog.csdn.net/csdn_chenhao/article/details/108983272
https://blog.csdn.net/qq_45069833/article/details/108428430
https://blog.csdn.net/u013089490/article/details/84323903