ElasticSearch 8.0+ 版本Windows系统启动

下载地址：https://www.elastic.co/cn/downloads/past-releases/winlogbeat-8-8-1

解压\elasticsearch\elasticsearch-8.5.1

 进入bin目录，启动elasticsearch.bat

问题1：

warning: ignoring JAVA_HOME=D:\jdk1.8.0_271; using bundled JDK

JDK问题，使用ES自带JDK

修改elasticsearch-env.bat文件

set JAVA="%ES_HOME%\jdk\bin\java.exe"
set JAVA_HOME="%ES_HOME%\jdk"

启动elasticsearch.bat

问题2：

 内存问题，修改\elasticsearch-8.5.1\config\jvm.options文件

启动elasticsearch.bat

问题3 

 修改conf目录下的elasticsearch.yml文件，新增一条配置，关闭更新配置

启动elasticsearch.bat成功。

记录密码

关闭密码：打开config 目录下面的 elasticsearch.yml 文件，把加密关闭

修改密码

修改elasticsearch.yml 改为

xpack.security.enabled: true

重启ES后bin目录下执行

./elasticsearch-setup-passwords interactive

出现异常

 修改命令

./elasticsearch-reset-password -u elastic -i

修改密码完成

问题4 

最大的坑！！！！！

最大的坑！！！！！

最大的坑！！！！！

ES8默认采用HTTPS请求，Java连接失败，需要将elasticsearch-8.5.1\config\certs下http_ca.crt证书配置到项目的resource目录下，或修改elasticsearch.yml配置文件，关闭https，注意将证书路径也注释掉。

 依赖配置

        
            org.elasticsearch
            elasticsearch
            8.7.1
        
        
            co.elastic.clients
            elasticsearch-java
            8.7.1
        
        
            org.apache.commons
            commons-pool2
            2.8.1
        
        
            jakarta.json
            jakarta.json-api
            2.0.1
        

代码

 try {
    HttpHost[] httpHosts = Arrays.stream(clusterNodes.split(",")).map(x -> {
        String[] hostInfo = x.split(":");
        return new HttpHost(hostInfo[0], Integer.parseInt(hostInfo[1]));
    }).toArray(HttpHost[]::new);

    final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
    //设置账号密码
   credentialsProvider.setCredentials(
        AuthScope.ANY, new UsernamePasswordCredentials(account, passWord));

   builder = RestClient.builder(httpHosts)
        .setHttpClientConfigCallback(httpClientBuilder ->
         httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
   // Create the low-level client
   restClient = builder.build();
   // Create the transport with a Jackson mapper
   transport = new RestClientTransport(restClient, new JacksonJsonpMapper());
   // And create the API client
   client = new ElasticsearchClient(transport);
   Boolean acknowledged = client.indices().create(c -> c.index("user")).acknowledged();
   System.out.println("<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>" + acknowledged);
} catch (Exception e) {
   e.printStackTrace();
}