Elasticsearch7SinkBuilder

Elasticsearch7SinkBuilder是Flink的一个类，用于构建将数据流写入Elasticsearch的sink。它提供了一些方法来配置Elasticsearch连接和请求重试策略。

以下是一个使用Elasticsearch7SinkBuilder的示例代码：

import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.connectors.elasticsearch7.Elasticsearch7SinkBuilder;
import org.apache.flink.streaming.connectors.elasticsearch7.RequestIndexer;
import org.apache.flink.streaming.connectors.elasticsearch7.common.ElasticsearchSink;
import org.apache.http.HttpHost;
import org.elasticsearch.client.Requests;

public class ElasticsearchSinkExample {
    public static void main(String[] args) throws Exception {
        // 创建一个Flink的DataStream
        DataStream<String> input = ...;

        // 创建Elasticsearch7SinkBuilder并配置连接信息
        Elasticsearch7SinkBuilder<String> esSinkBuilder = new Elasticsearch7SinkBuilder<>(
                new HttpHost("127.0.0.1", 9200, "http"),
                (element, context, indexer) -> {
                    // 创建要索引的请求
                    indexer.add(Requests.indexRequest()
                            .index("your-index")
                            .source(element));
                }
        );

        // 配置请求重试策略
        esSinkBuilder.setBulkFlushBackoffStrategy(
                ElasticsearchSinkBase.FlushBackoffType.EXPONENTIAL,
                5, // 最大重试次数
                1000 // 初始延迟（毫秒）
        );

        // 构建ElasticsearchSink并将数据流写入Elasticsearch
        ElasticsearchSink<String> elasticsearchSink = esSinkBuilder.build();
        input.addSink(elasticsearchSink);

        // 执行任务
        env.execute("Elasticsearch Sink Example");
    }
}

这个示例代码演示了如何使用Elasticsearch7SinkBuilder来配置Elasticsearch连接和请求重试策略，并将数据流写入Elasticsearch。