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1. received plaintext http traffic on an https channel, closing connection Netty4HttpChannel

[2022-02-16T21:08:50,085][WARN ][o.e.x.s.t.n.SecurityNetty4HttpServerTransport] [DESKTOP-VCT39JM] received plaintext http traffic on an https channel, closing connection Netty4HttpChannel{localAddress=/[0:0:0:0:0:0:0:1]:9200, remoteAddress=/[0:0:0:0:0:0:0:1]:1172}

解決

是因為開啟了 ssl 認證。
在 ES/config/elasticsearch.yml 文件中把 xpack.security.http.ssl:enabled 設(shè)置成 false 即可

# Enable encryption for HTTP API client connections, such as Kibana, Logstash, and Agents
xpack.security.http.ssl:
  enabled: false
  keystore.path: certs/http.p12

2. elasticsearch 賬號密碼

windows 下直接啟動 ElasticSearch ，見到 started 為成功啟動，訪問 htttp://localhost:9200 需要輸入密碼，是因為開啟了密碼驗證模式。
找了一輪沒看到有賬號密碼，干脆就設(shè)置免密登錄就好。

解決

找到 elasticsearch.yml 文件， 把 xpack.security.enabled 屬性設(shè)置為 false 即可。

# Enable security features
xpack.security.enabled: false

3. 設(shè)置內(nèi)存大小

ES 的內(nèi)存是自己調(diào)節(jié)的。在 config/jvm.options 文件中直接設(shè)置就好(追加):

-Xms512m
-Xmx2048m

4. windows Could not rename log file 'logs/gc.log’ to 'logs/gc.log.14’ (Permission denied).

ES 在 windows 中只允許打開一個應(yīng)用程序，當你再想去創(chuàng)建一個 ES 應(yīng)用程序的時候，就會顯示 Permission denied，即使是使用 cmd 管理員運行 elasticsearch.bat 文件也是一樣的錯誤。

• 解決： 注意查看是否已經(jīng)在別的地方已經(jīng)打開 ES 服務(wù)，實在不行則進行電腦重啟

5. org/elasticsearch/action/ActionRequest has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0

public static void main(String[] args) throws IOException {
    // 創(chuàng)建 ES 客戶端
    RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(new HttpHost(Constants.HOST, Constants.PORT, Constants.HTTP))
    );

    client.close();
}

通過上述代碼，使用 RestHighLevelCilent 訪問 ES 客戶端的時候，出現(xiàn)以下錯誤：Exception in thread "main" java.lang.UnsupportedClassVersionError:org/elasticsearch/action/ActionRequest has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 52.0

看到注釋，我們知道是版本不兼容的問題，查找資料看到這樣一個表：

Major version numbers map to Java versions:

45 = Java 1.1
46 = Java 1.2
47 = Java 1.3
48 = Java 1.4
49 = Java 5
50 = Java 6
51 = Java 7
52 = Java 8
53 = Java 9
54 = Java 10
55 = Java 11
56 = Java 12
57 = Java 13

講道理在這個版本任你發(fā)，我用Java8 的年代，RestHighLevelClient 肯定是兼容Java 8 的，那么就只有 ES 版本太高了，把 pom.xml 的 ES 依賴版本降到跟 elasticsearch-rest-high-level-client 一樣就可以了

<properties>
    <elasticsearch.version>7.17.0</elasticsearch.version>   	 																	<elasticsearch.client.version>7.17.0</elasticsearch.client.version>
</properties>

<dependies>
    <dependency>
        <groupId>org.elasticsearch</groupId>
        <artifactId>elasticsearch</artifactId>
        <version>${elasticsearch.version}</version>
    </dependency>
    <dependency>
        <groupId>org.elasticsearch.client</groupId>
        <artifactId>elasticsearch-rest-high-level-client</artifactId>
        <version>${elasticsearch.client.version}</version>
    </dependency>
</dependies>

• 解決：把 pom.xml 的 elasticsearch 和 elasticsearch-rest-high-level-client 版本一致即可。