flink-connector-elasticsearch7/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/table/Elasticsearch7DynamicSink.java [248:261]:
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        public void configureRestClientBuilder(RestClientBuilder restClientBuilder) {
            if (pathPrefix != null) {
                restClientBuilder.setPathPrefix(pathPrefix);
            }
            if (credentialsProvider == null) {
                credentialsProvider = new BasicCredentialsProvider();
                credentialsProvider.setCredentials(
                        AuthScope.ANY, new UsernamePasswordCredentials(username, password));
            }
            restClientBuilder.setHttpClientConfigCallback(
                    httpAsyncClientBuilder ->
                            httpAsyncClientBuilder.setDefaultCredentialsProvider(
                                    credentialsProvider));
        }
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flink-connector-elasticsearch6/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/table/Elasticsearch6DynamicSink.java [253:266]:
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        public void configureRestClientBuilder(RestClientBuilder restClientBuilder) {
            if (pathPrefix != null) {
                restClientBuilder.setPathPrefix(pathPrefix);
            }
            if (credentialsProvider == null) {
                credentialsProvider = new BasicCredentialsProvider();
                credentialsProvider.setCredentials(
                        AuthScope.ANY, new UsernamePasswordCredentials(username, password));
            }
            restClientBuilder.setHttpClientConfigCallback(
                    httpAsyncClientBuilder ->
                            httpAsyncClientBuilder.setDefaultCredentialsProvider(
                                    credentialsProvider));
        }
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