1、查看版本
curl -u elastic:elastic -XGET 'http://172.16.1.61:9200/_xpack/license'
"type" : "basic" 则为基础班
打印如下

  "license" : {
    "status" : "active",
    "uid" : "703a69ef-d80f-475e-812f-37c78d90a5a3",
    "type" : "basic",
    "issue_date" : "2022-04-29T00:00:00.000Z",
    "issue_date_in_millis" : 1651190400000,
    "expiry_date" : "2036-10-16T05:03:20.000Z",
    "expiry_date_in_millis" : 2107746200000,
    "max_nodes" : 100,
    "issued_to" : "zhy sy (fdascs.com)",
    "issuer" : "Web Form",
    "start_date_in_millis" : 1651190400000
  }

}2、创建类
2个类
并且替换到如下jar中
elasticsearch-7.5.1/modules/x-pack-core/x-pack-core-7.5.1.jar
2.1、LicenseVerifier

package org.elasticsearch.license;

/**
 * @author zgb on 2020/1/8
 */
public class LicenseVerifier {
    public static boolean verifyLicense(final License license, final byte[] encryptedPublicKeyData) {
        return true;
    }

    public static boolean verifyLicense(final License license) {
        return true;
    }
}

}2.2、
XPackBuild

package org.elasticsearch.xpack.core;

import java.net.URISyntaxException;
import java.net.URL;
import java.nio.file.Path;

import org.elasticsearch.common.SuppressForbidden;
import org.elasticsearch.common.io.PathUtils;

public class XPackBuild {
    public static final XPackBuild CURRENT;
    private String shortHash;
    private String date;

    @SuppressForbidden(reason = "looks up path of xpack.jar directly")
    static Path getElasticsearchCodebase() {
        final URL url = XPackBuild.class.getProtectionDomain().getCodeSource().getLocation();
        try {
            return PathUtils.get(url.toURI());
        } catch (URISyntaxException bogus) {
            throw new RuntimeException(bogus);
        }
    }

    XPackBuild(final String shortHash, final String date) {
        this.shortHash = shortHash;
        this.date = date;
    }

    public String shortHash() {
        return this.shortHash;
    }

    public String date() {
        return this.date;
    }

    static {
        final Path path = getElasticsearchCodebase();
        String shortHash = null;
        String date = null;
        Label_0109:
        {
            shortHash = "Unknown";
            date = "Unknown";
        }
        CURRENT = new XPackBuild(shortHash, date);
    }
}

3、jar上传替换
4、申请证书
申请地址 https://license.elastic.co/registration

并修改证书 type 的 basic 为 platinum

5、上传证书
5.1、上传之前需要修改一下配置文件
打开elasticsearch.yml配置文件加入 xpack.security.enabled:false

cat @license.json | curl -H "Content-Type:application/json" -X POST -d @- http://172.16.1.61:9200/_xpack/license

结果出现 {"acknowledged":true,"license_status":"valid"}

则说明成功
curl -XPUT 'http://172.16.1.61:9200/_xpack/license' -H "Content-Type: application/json" -d @license.json