【异常】ES报错ElasticsearchStatusException：missing authentication credentials for REST request

一、报错内容

Exception in thread "main" ElasticsearchStatusException[Elasticsearch exception [type=security_exception, reason=missing authentication credentials for REST request [/user2?master_timeout=30s&ignore_unavailable=false&expand_wildcards=open%2Cclosed&allow_no_indices=true&ignore_throttled=false&timeout=30s]]]
	at org.elasticsearch.rest.BytesRestResponse.errorFromXContent(BytesRestResponse.java:176)
	at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:2011)
	at org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:1988)
	at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1745)
	at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1702)
	at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1672)
	at org.elasticsearch.client.IndicesClient.delete(IndicesClient.java:103)
	at com.xxx.elasticsearch.operation.main(operation.java:26)
	Suppressed: org.elasticsearch.client.ResponseException: method [DELETE], host [http://10.219.87.159:32705], URI [/user2?master_timeout=30s&ignore_unavailable=false&expand_wildcards=open%2Cclosed&allow_no_indices=true&ignore_throttled=false&timeout=30s], status line [HTTP/1.1 401 Unauthorized]
{"error":{"root_cause":[{"type":"security_exception","reason":"missing authentication credentials for REST request [/user2?master_timeout=30s&ignore_unavailable=false&expand_wildcards=open%2Cclosed&allow_no_indices=true&ignore_throttled=false&timeout=30s]","header":{"WWW-Authenticate":"Basic realm=\"security\" charset=\"UTF-8\""}}],"type":"security_exception","reason":"missing authentication credentials for REST request [/user2?master_timeout=30s&ignore_unavailable=false&expand_wildcards=open%2Cclosed&allow_no_indices=true&ignore_throttled=false&timeout=30s]","header":{"WWW-Authenticate":"Basic realm=\"security\" charset=\"UTF-8\""}},"status":401}
		at org.elasticsearch.client.RestClient.convertResponse(RestClient.java:326)
		at org.elasticsearch.client.RestClient.performRequest(RestClient.java:296)
		at org.elasticsearch.client.RestClient.performRequest(RestClient.java:270)
		at org.elasticsearch.client.RestHighLevelClient.performClientRequest(RestHighLevelClient.java:2082)
		at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1732)
		... 4 more

二、报错内容

使用Flink输出（sink）到Elasticsearch时，出现了上面的错误，是因为登录到ES，ES启用了账号密码的模式，因此必须要使用账号密码才能够访问它。

三、报错解决

于是新增如下代码后，问题解决

ElasticsearchSink.Builder<String> esSinkBuilder = new ElasticsearchSink.Builder<>(httpHosts,
       new ElasticsearchSinkFunction<String>() {
           public IndexRequest createIndexRequest(String element) {
               Map<String, String> json = new HashMap<>();
               json.put("data", element);
               return Requests.indexRequest()
                       .index("您的索引名")
                       //.type("my-type")
                       .source(json);
           }

           @Override
           public void process(String element, RuntimeContext ctx, RequestIndexer indexer) {
               indexer.add(createIndexRequest(element));
           }
       }
);
// 鉴权，正对写 es 需要密码的场景
esSinkBuilder.setRestClientFactory(new HDRestClientFactory("您的账号名", "您的密码"));

public class HDRestClientFactory implements RestClientFactory {

    private String userName;
    private String password;
    transient CredentialsProvider credentialsProvider;

    public HDRestClientFactory(String userName, String password) {
        this.userName = userName;
        this.password = password;
    }

    @Override
    public void configureRestClientBuilder(RestClientBuilder restClientBuilder) {
        if (credentialsProvider == null) {
            credentialsProvider = new BasicCredentialsProvider();
            credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(userName, password));
        }
        restClientBuilder.setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
            @Override
            public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpAsyncClientBuilder) {
                return httpAsyncClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
            }
        }).setRequestConfigCallback(new RestClientBuilder.RequestConfigCallback() {
            @Override
            public RequestConfig.Builder customizeRequestConfig(RequestConfig.Builder builder) {
                builder.setConnectTimeout(5000);
                builder.setSocketTimeout(60000);
                builder.setConnectionRequestTimeout(2000);
                return builder;
            }
        });
    }
}