SpringData、SparkStreaming和Flink集成Elasticsearch

本文代码链接:https://download.csdn.net/download/shangjg03/88522188

1 Spring Data框架集成

1 .1 Spring Data框架介绍

Spring Data是一个用于简化数据库、非关系型数据库、索引库访问,并支持云服务的开源框架。其主要目标是使得对数据的访问变得方便快捷,并支持map-reduce框架和云计算数据服务。 Spring Data可以极大的简化JPA(Elasticsearch...)的写法,可以在几乎不用写实现的情况下,实现对数据的访问和操作。除了CRUD外,还包括如分页、排序等一些常用的功能。

Spring Data的官网:Spring Data

Spring Data常用的功能模块如下:

1 . 2 Spring Data Elasticsearch介绍

Spring Data Elasticsearch 基于 spring data API 简化 Elasticsearch操作,将原始操作Elasticsearch的客户端API 进行封装 。Spring Data为Elasticsearch项目提供集成搜索引擎。Spring Data Elasticsearch POJO的关键功能区域为中心的模型与Elastichsearch交互文档和轻松地编写一个存储索引库数据访问层。

官方网站: https://spring.io/projects/spring-data-elasticsearch

1 . 3 Spring Data Elasticsearch版本对比

目前最新springboot对应Elasticsearch7.6.2,Spring boot2.3.x一般可以兼容Elasticsearch7.x

1 . 4 框架集成

  1. 创建Maven项目
  1. 修改pom文件,增加依赖关系
复制代码
<?xml` `version="1.0"` `encoding="UTF-8"?>`
`<project` `xmlns="http://maven.apache.org/POM/4.0.0"`
         `xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"`
         `xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">`
    `<modelVersion>4.0.0</modelVersion>`

    `<parent>`
        `<groupId>org.springframework.boot</groupId>`
        `<artifactId>spring-boot-starter-parent</artifactId>`
        `<version>2.3.6.RELEASE</version>`
        `<relativePath/>`
    `</parent>`


    `<groupId>com.shangjack.es</groupId>`
    `<artifactId>springdata-elasticsearch</artifactId>`
    `<version>1.0</version>`

    `<properties>`
        `<maven.compiler.source>8</maven.compiler.source>`
        `<maven.compiler.target>8</maven.compiler.target>`
    `</properties>`

    `<dependencies>`
        `<dependency>`
            `<groupId>org.projectlombok</groupId>`
            `<artifactId>lombok</artifactId>`
        `</dependency>`

        `<dependency>`
            `<groupId>org.springframework.boot</groupId>`
            `<artifactId>spring-boot-starter-data-elasticsearch</artifactId>`
        `</dependency>`

        `<dependency>`
            `<groupId>org.springframework.boot</groupId>`
            `<artifactId>spring-boot-devtools</artifactId>`
            `<scope>runtime</scope>`
            `<optional>true</optional>`
        `</dependency>`
        `<dependency>`
            `<groupId>org.springframework.boot</groupId>`
            `<artifactId>spring-boot-starter-test</artifactId>`
            `<scope>test</scope>`
        `</dependency>`
        `<dependency>`
            `<groupId>org.springframework.boot</groupId>`
            `<artifactId>spring-boot-test</artifactId>`
        `</dependency>`
        `<dependency>`
            `<groupId>junit</groupId>`
            `<artifactId>junit</artifactId>`
        `</dependency>`
        `<dependency>`
            `<groupId>org.springframework</groupId>`
            `<artifactId>spring-test</artifactId>`
        `</dependency>`
    `</dependencies>`
`</project>`

`
  1. 增加配置文件

在resources目录中增加application.properties文件

复制代码
# es服务地址`
`elasticsearch.host=127.0.0.1`
`# es服务端口`
`elasticsearch.port=9200`
`# 配置日志级别,开启debug日志`
`logging.level.com.shangjack.es=debug`
`
  1. SpringBoot主程序

package com.shangjack.es;

复制代码
`
`import` `org.springframework.boot.SpringApplication;`
`import` `org.springframework.boot.autoconfigure.SpringBootApplication;`

`@SpringBootApplication`
`public` `class` `SpringDataElasticSearchMainApplication` `{`
    `public` `static` `void` `main(String[]` `args)` `{`
        `SpringApplication.run(SpringDataElasticSearchMainApplication.class,args);`
    `}`
`}`
`数据实体类`
`package` `com.shangjack.es;`

`import` `lombok.AllArgsConstructor;`
`import` `lombok.Data;`
`import` `lombok.NoArgsConstructor;`
`import` `lombok.ToString;`

`@Data`
`@NoArgsConstructor`
`@AllArgsConstructor`
`@ToString`
`public` `class` `Product` `{`
    `private` `Long` `id;//商品唯一标识`
    `private` `String` `title;//商品名称`
    `private` `String` `category;//分类名称`
    `private` `Double` `price;//商品价格`
    `private` `String` `images;//图片地址`

`}`
`
  1. 配置类
  • ElasticsearchRestTemplate是spring-data-elasticsearch项目中的一个类,和其他spring项目中的template类似。
  • 在新版的spring-data-elasticsearch中,ElasticsearchRestTemplate代替了原来的ElasticsearchTemplate。
  • 原因是ElasticsearchTemplate基于TransportClient,TransportClient即将在8.x以后的版本中移除。所以,我们推荐使用ElasticsearchRestTemplate。
  • ElasticsearchRestTemplate基于RestHighLevelClient客户端的。需要自定义配置类,继承AbstractElasticsearchConfiguration,并实现elasticsearchClient()抽象方法,创建RestHighLevelClient对象。
复制代码
package` `com.shangjack.es;`

`import` `lombok.Data;`
`import` `org.apache.http.HttpHost;`
`import` `org.elasticsearch.client.RestClient;`
`import` `org.elasticsearch.client.RestClientBuilder;`
`import` `org.elasticsearch.client.RestHighLevelClient;`
`import` `org.springframework.boot.context.properties.ConfigurationProperties;`
`import` `org.springframework.context.annotation.Configuration;`
`import` `org.springframework.data.elasticsearch.config.AbstractElasticsearchConfiguration;`

`@ConfigurationProperties(prefix` `=` `"elasticsearch")`
`@Configuration`
`@Data`
`public` `class` `ElasticsearchConfig` `extends` `AbstractElasticsearchConfiguration` `{`
    `private` `String` `host` `;`
    `private` `Integer` `port` `;`

    `//重写父类方法`
`    @Override`
    `public` `RestHighLevelClient` `elasticsearchClient()` `{`
        `RestClientBuilder` `builder` `=` `RestClient.builder(new` `HttpHost(host,` `port));`
        `RestHighLevelClient` `restHighLevelClient` `=` `new` `RestHighLevelClient(builder);`
        `return` `restHighLevelClient;`
    `}`
`}`
`
  1. DAO数据访问对象
复制代码
package` `com.shangjack.es;`

`import` `org.springframework.data.elasticsearch.repository.ElasticsearchRepository;`
`import` `org.springframework.stereotype.Repository;`

`@Repository`
`public` `interface` `ProductDao` `extends` `ElasticsearchRepository<Product,Long>` `{`

`}`
`
  1. 实体类映射操作
复制代码
package` `com.shangjack.es;`

`import` `lombok.AllArgsConstructor;`
`import` `lombok.Data;`
`import` `lombok.NoArgsConstructor;`
`import` `lombok.ToString;`
`import` `org.springframework.data.annotation.Id;`
`import` `org.springframework.data.elasticsearch.annotations.Document;`
`import` `org.springframework.data.elasticsearch.annotations.Field;`
`import` `org.springframework.data.elasticsearch.annotations.FieldType;`

`@Data`
`@NoArgsConstructor`
`@AllArgsConstructor`
`@ToString`
`@Document(indexName` `=` `"shopping",` `shards` `=` `3,` `replicas` `=` `1)`
`public` `class` `Product` `{`
    `//必须有id,这里的id是全局唯一的标识,等同于es中的"_id"`
`    @Id`
    `private` `Long` `id;//商品唯一标识`
    `/**`
     `*` `type` `: 字段数据类型`
     `*` `analyzer` `: 分词器类型`
     `*` `index` `: 是否索引(默认:true)`
     `*` `Keyword` `: 短语,不进行分词`
     `*/`

`    @Field(type` `=` `FieldType.Text,` `analyzer` `=` `"ik_max_word")`
    `private` `String` `title;//商品名称`
`    @Field(type` `=` `FieldType.Keyword)`
    `private` `String` `category;//分类名称`
`    @Field(type` `=` `FieldType.Double)`
    `private` `Double` `price;//商品价格`
`    @Field(type` `=` `FieldType.Keyword,` `index` `=` `false)`
    `private` `String` `images;//图片地址`
`}`
`
  1. 索引操作
复制代码
package` `com.shangjack.es;`

`import` `org.junit.Test;`
`import` `org.junit.runner.RunWith;`
`import` `org.springframework.beans.factory.annotation.Autowired;`
`import` `org.springframework.boot.test.context.SpringBootTest;`
`import` `org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;`
`import` `org.springframework.test.context.junit4.SpringRunner;`

`@RunWith(SpringRunner.class)`
`@SpringBootTest`
`public` `class` `SpringDataESIndexTest` `{`
    `//注入ElasticsearchRestTemplate`
`    @Autowired`
    `private` `ElasticsearchRestTemplate` `elasticsearchRestTemplate;`

    `//创建索引并增加映射配置`
`    @Test`
    `public` `void` `createIndex(){`
        `//创建索引,系统初始化会自动创建索引`
        `System.out.println("创建索引");`
    `}`

`    @Test`
    `public` `void` `deleteIndex(){`
        `//创建索引,系统初始化会自动创建索引`
        `boolean` `flg` `=` `elasticsearchRestTemplate.deleteIndex(Product.class);`
        `System.out.println("删除索引 = "` `+` `flg);`
    `}`
`}`
`
  1. 文档操作
复制代码
package` `com.shangjack.es;`

`import` `org.junit.Test;`
`import` `org.junit.runner.RunWith;`
`import` `org.springframework.beans.factory.annotation.Autowired;`
`import` `org.springframework.boot.test.context.SpringBootTest;`
`import` `org.springframework.data.domain.Page;`
`import` `org.springframework.data.domain.PageRequest;`
`import` `org.springframework.data.domain.Sort;`
`import` `org.springframework.test.context.junit4.SpringRunner;`

`import` `java.util.ArrayList;`
`import` `java.util.List;`

`@RunWith(SpringRunner.class)`
`@SpringBootTest`
`public` `class` `SpringDataESProductDaoTest` `{`
`    @Autowired`
    `private` `ProductDao` `productDao;`

    `/**`
     `* 新增`
     `*/`
`    @Test`
    `public` `void` `save(){`
        `Product` `product` `=` `new` `Product();`
        `product.setId(2L);`
        `product.setTitle("华为手机");`
        `product.setCategory("手机");`
        `product.setPrice(2999.0);`
        `product.setImages("http://www.shangjack/hw.jpg");`
        `productDao.save(product);`
    `}`

    `//修改`
`    @Test`
    `public` `void` `update(){`
        `Product` `product` `=` `new` `Product();`
        `product.setId(1L);`
        `product.setTitle("小米2手机");`
        `product.setCategory("手机");`
        `product.setPrice(9999.0);`
        `product.setImages("http://www.shangjack/xm.jpg");`
        `productDao.save(product);`
    `}`

    `//根据id查询`
`    @Test`
    `public` `void` `findById(){`
        `Product` `product` `=` `productDao.findById(1L).get();`
        `System.out.println(product);`
    `}`

    `//查询所有`
`    @Test`
    `public` `void` `findAll(){`
        `Iterable<Product>` `products` `=` `productDao.findAll();`
        `for` `(Product` `product` `:` `products)` `{`
            `System.out.println(product);`
        `}`
    `}`

    `//删除`
`    @Test`
    `public` `void` `delete(){`
        `Product` `product` `=` `new` `Product();`
        `product.setId(1L);`
        `productDao.delete(product);`
    `}`

    `//批量新增`
`    @Test`
    `public` `void` `saveAll(){`
        `List<Product>` `productList` `=` `new` `ArrayList<>();`
        `for` `(int` `i` `=` `0;` `i` `<` `10;` `i++)` `{`
            `Product` `product` `=` `new` `Product();`
            `product.setId(Long.valueOf(i));`
            `product.setTitle("["+i+"]小米手机");`
            `product.setCategory("手机");`
            `product.setPrice(1999.0+i);`
            `product.setImages("http://www.shangjack/xm.jpg");`
            `productList.add(product);`
        `}`
        `productDao.saveAll(productList);`
    `}`

    `//分页查询`
`    @Test`
    `public` `void` `findByPageable(){`
        `//设置排序(排序方式,正序还是倒序,排序的id)`
        `Sort` `sort` `=` `Sort.by(Sort.Direction.DESC,"id");`
        `int` `currentPage=0;//当前页,第一页从0开始,1表示第二页`
        `int` `pageSize` `=` `5;//每页显示多少条`
        `//设置查询分页`
        `PageRequest` `pageRequest` `=` `PageRequest.of(currentPage,` `pageSize,sort);`
        `//分页查询`
        `Page<Product>` `productPage` `=` `productDao.findAll(pageRequest);`
        `for` `(Product` `Product` `:` `productPage.getContent())` `{`
            `System.out.println(Product);`
        `}`
    `}`
`}`
`
  1. 文档搜索
复制代码
package` `com.shangjack.es;`

`import` `org.elasticsearch.index.query.QueryBuilders;`
`import` `org.elasticsearch.index.query.TermQueryBuilder;`
`import` `org.junit.Test;`
`import` `org.junit.runner.RunWith;`
`import` `org.springframework.beans.factory.annotation.Autowired;`
`import` `org.springframework.boot.test.context.SpringBootTest;`
`import` `org.springframework.data.domain.PageRequest;`
`import` `org.springframework.test.context.junit4.SpringRunner;`

`@RunWith(SpringRunner.class)`
`@SpringBootTest`
`public` `class` `SpringDataESSearchTest` `{`
`    @Autowired`
    `private` `ProductDao` `productDao;`

    `/**`
     `*` `term查询`
     `*` `search(termQueryBuilder) 调用搜索方法,参数查询构建器对象`
     `*/`
`    @Test`
    `public` `void` `termQuery(){`
        `TermQueryBuilder` `termQueryBuilder` `=` `QueryBuilders.termQuery("title",` `"小米");`
        `Iterable<Product>` `products` `=` `productDao.search(termQueryBuilder);`
        `for` `(Product` `product` `:` `products)` `{`
            `System.out.println(product);`
        `}`
    `}`

    `/**`
     `*` `term查询加分页`
     `*/`
`    @Test`
    `public` `void` `termQueryByPage(){`
        `int` `currentPage=` `0` `;`
        `int` `pageSize` `=` `5;`
        `//设置查询分页`
        `PageRequest` `pageRequest` `=` `PageRequest.of(currentPage,` `pageSize);`
        `TermQueryBuilder` `termQueryBuilder` `=` `QueryBuilders.termQuery("title",` `"小米");`
        `Iterable<Product>` `products` `=` `productDao.search(termQueryBuilder,pageRequest);`
        `for` `(Product` `product` `:` `products)` `{`
            `System.out.println(product);`
        `}`
    `}`

`}`
`

2 Spark Streaming框架集成

2 .1 Spark Streaming框架介绍

Spark Streaming是Spark core API的扩展,支持实时数据流的处理,并且具有可扩展,高吞吐量,容错的特点。 数据可以从许多来源获取,如Kafka,Flume,Kinesis或TCP sockets,并且可以使用复杂的算法进行处理,这些算法使用诸如map,reduce,join和window等高级函数表示。 最后,处理后的数据可以推送到文件系统,数据库等。 实际上,您可以将Spark的机器学习和图形处理算法应用于数据流。

2 . 2 框架集成

  1. 创建Maven项目
  1. 修改pom文件,增加依赖关系
复制代码
<?xml` `version="1.0"` `encoding="UTF-8"?>`
`<project` `xmlns="http://maven.apache.org/POM/4.0.0"`
         `xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"`
         `xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">`
    `<modelVersion>4.0.0</modelVersion>`

    `<groupId>com.shangjack.es</groupId>`
    `<artifactId>sparkstreaming-elasticsearch</artifactId>`
    `<version>1.0</version>`

    `<properties>`
        `<maven.compiler.source>8</maven.compiler.source>`
        `<maven.compiler.target>8</maven.compiler.target>`
    `</properties>`

    `<dependencies>`
        `<dependency>`
            `<groupId>org.apache.spark</groupId>`
            `<artifactId>spark-core_2.12</artifactId>`
            `<version>3.0.0</version>`
        `</dependency>`
        `<dependency>`
            `<groupId>org.apache.spark</groupId>`
            `<artifactId>spark-streaming_2.12</artifactId>`
            `<version>3.0.0</version>`
        `</dependency>`
        `<dependency>`
            `<groupId>org.elasticsearch</groupId>`
            `<artifactId>elasticsearch</artifactId>`
            `<version>7.8.0</version>`
        `</dependency>`
        `<!--` `elasticsearch的客户端 -->`
        `<dependency>`
            `<groupId>org.elasticsearch.client</groupId>`
            `<artifactId>elasticsearch-rest-high-level-client</artifactId>`
            `<version>7.8.0</version>`
        `</dependency>`
        `<!--` `elasticsearch依赖2.x的log4j` `-->`
        `<dependency>`
            `<groupId>org.apache.logging.log4j</groupId>`
            `<artifactId>log4j-api</artifactId>`
            `<version>2.8.2</version>`
        `</dependency>`
        `<dependency>`
            `<groupId>org.apache.logging.log4j</groupId>`
            `<artifactId>log4j-core</artifactId>`
            `<version>2.8.2</version>`
        `</dependency>`
`<!--`        `<dependency>-->`
`<!--`            `<groupId>com.fasterxml.jackson.core</groupId>-->`
`<!--`            `<artifactId>jackson-databind</artifactId>-->`
`<!--`            `<version>2.11.1</version>-->`
`<!--`        `</dependency>-->`
`<!--`        `&lt;!&ndash;` `junit单元测试 &ndash;&gt;-->`
`<!--`        `<dependency>-->`
`<!--`            `<groupId>junit</groupId>-->`
`<!--`            `<artifactId>junit</artifactId>-->`
`<!--`            `<version>4.12</version>-->`
`<!--`        `</dependency>-->`
    `</dependencies>`
`</project>`

`
  1. 功能实现
复制代码
package` `com.shangjack.es`

`import` `org.apache.http.HttpHost`
`import` `org.apache.spark.SparkConf`
`import` `org.apache.spark.streaming.dstream.ReceiverInputDStream`
`import` `org.apache.spark.streaming.{Seconds,` `StreamingContext}`
`import` `org.elasticsearch.action.index.IndexRequest`
`import` `org.elasticsearch.client.indices.CreateIndexRequest`
`import` `org.elasticsearch.client.{RequestOptions,` `RestClient,` `RestHighLevelClient}`
`import` `org.elasticsearch.common.xcontent.XContentType`

`import` `java.util.Date`

`object` `SparkStreamingESTest` `{`

    `def` `main(args:` `Array[String]):` `Unit` `=` `{`
        `val` `sparkConf` `=` `new` `SparkConf().setMaster("local[*]").setAppName("ESTest")`
        `val` `ssc` `=` `new` `StreamingContext(sparkConf,` `Seconds(3))`

        `val` `ds:` `ReceiverInputDStream[String]` `=` `ssc.socketTextStream("localhost",` `9999)`

        `ds.foreachRDD(`
            `rdd` `=>` `{`
                `println("*************** "` `+` `new` `Date())`
                `rdd.foreach(`
                    `data` `=>` `{`
                        `val` `client` `=` `new` `RestHighLevelClient(`
                            `RestClient.builder(new` `HttpHost("localhost",` `9200,` `"http"))`
                        `);`
                        `// 新增文档 - 请求对象`
                        `val` `request` `=` `new` `IndexRequest();`
                        `// 设置索引及唯一性标识`
                        `val` `ss` `=` `data.split(" ")`
                        `println("ss = "` `+` `ss.mkString(","))`
                        `request.index("sparkstreaming").id(ss(0));`
                        `val` `productJson` `=`
                            `s"""`
                              `|` `{` `"data":"${ss(1)}"` `}`
                              `|""".stripMargin;`
                        `// 添加文档数据,数据格式为JSON格式`
                        `request.source(productJson,XContentType.JSON);`
                        `// 客户端发送请求,获取响应对象`
                        `val` `response` `=` `client.index(request,` `RequestOptions.DEFAULT);`
                        `System.out.println("_index:"` `+` `response.getIndex());`
                        `System.out.println("_id:"` `+` `response.getId());`
                        `System.out.println("_result:"` `+` `response.getResult());`

                        `client.close()`
                    `}`
                `)`
            `}`
        `)`

        `ssc.start()`
        `ssc.awaitTermination()`
    `}`
`}`
`

3 Flink框架集成

3 .1 Flink框架介绍

Apache Spark是一种基于内存的快速、通用、可扩展的大数据分析计算引擎。

Apache Spark掀开了内存计算的先河,以内存作为赌注,赢得了内存计算的飞速发展。但是在其火热的同时,开发人员发现,在Spark中,计算框架普遍存在的缺点和不足依然没有完全解决,而这些问题随着5G时代的来临以及决策者对实时数据分析结果的迫切需要而凸显的更加明显:

  • 数据精准一次性处理(Exactly-Once)
  • 乱序数据,迟到数据
  • 低延迟,高吞吐,准确性
  • 容错性

Apache Flink是一个框架和分布式处理引擎,用于对无界和有界数据流进行有状态计算。在Spark火热的同时,也默默地发展自己,并尝试着解决其他计算框架的问题。

慢慢地,随着这些问题的解决,Flink慢慢被绝大数程序员所熟知并进行大力推广,阿里公司在2015年改进Flink,并创建了内部分支Blink,目前服务于阿里集团内部搜索、推荐、广告和蚂蚁等大量核心实时业务。

3 . 2 框架集成

  1. 创建Maven项目
  1. 修改pom文件,增加相关依赖类库
复制代码
<?xml` `version="1.0"` `encoding="UTF-8"?>`
`<project` `xmlns="http://maven.apache.org/POM/4.0.0"`
         `xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"`
         `xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">`
    `<modelVersion>4.0.0</modelVersion>`

    `<groupId>com.shangjack.es</groupId>`
    `<artifactId>flink-elasticsearch</artifactId>`
    `<version>1.0</version>`

    `<properties>`
        `<maven.compiler.source>8</maven.compiler.source>`
        `<maven.compiler.target>8</maven.compiler.target>`
    `</properties>`

    `<dependencies>`
        `<dependency>`
            `<groupId>org.apache.flink</groupId>`
            `<artifactId>flink-scala_2.12</artifactId>`
            `<version>1.12.0</version>`
        `</dependency>`
        `<dependency>`
            `<groupId>org.apache.flink</groupId>`
            `<artifactId>flink-streaming-scala_2.12</artifactId>`
            `<version>1.12.0</version>`
        `</dependency>`
        `<dependency>`
            `<groupId>org.apache.flink</groupId>`
            `<artifactId>flink-clients_2.12</artifactId>`
            `<version>1.12.0</version>`
        `</dependency>`

        `<dependency>`
            `<groupId>org.apache.flink</groupId>`
            `<artifactId>flink-connector-elasticsearch7_2.11</artifactId>`
            `<version>1.12.0</version>`
        `</dependency>`

        `<!--` `jackson` `-->`
        `<dependency>`
            `<groupId>com.fasterxml.jackson.core</groupId>`
            `<artifactId>jackson-core</artifactId>`
            `<version>2.11.1</version>`
        `</dependency>`
    `</dependencies>`
`</project>`
`
  1. 功能实现
复制代码
package` `com.shangjack.es;`

`import` `org.apache.flink.api.common.functions.RuntimeContext;`
`import` `org.apache.flink.streaming.api.datastream.DataStreamSource;`
`import` `org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;`
`import` `org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkFunction;`
`import` `org.apache.flink.streaming.connectors.elasticsearch.RequestIndexer;`
`import` `org.apache.flink.streaming.connectors.elasticsearch7.ElasticsearchSink;`
`import` `org.apache.http.HttpHost;`
`import` `org.elasticsearch.action.index.IndexRequest;`
`import` `org.elasticsearch.client.Requests;`

`import` `java.util.ArrayList;`
`import` `java.util.HashMap;`
`import` `java.util.List;`
`import` `java.util.Map;`

`public` `class` `FlinkElasticsearchSinkTest` `{`
    `public` `static` `void` `main(String[]` `args)` `throws` `Exception` `{`

        `StreamExecutionEnvironment` `env` `=` `StreamExecutionEnvironment.getExecutionEnvironment();`

        `DataStreamSource<String>` `source` `=` `env.socketTextStream("localhost",` `9999);`

        `List<HttpHost>` `httpHosts` `=` `new` `ArrayList<>();`
        `httpHosts.add(new` `HttpHost("127.0.0.1",` `9200,` `"http"));`
        `//httpHosts.add(new` `HttpHost("10.2.3.1",` `9200,` `"http"));`

`//` `use` `a` `ElasticsearchSink.Builder` `to` `create` `an` `ElasticsearchSink`
        `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("my-index")`
                                `//.type("my-type")`
                                `.source(json);`
                    `}`

`                    @Override`
                    `public` `void` `process(String` `element,` `RuntimeContext` `ctx,` `RequestIndexer` `indexer)` `{`
                        `indexer.add(createIndexRequest(element));`
                    `}`
                `}`
        `);`

`//` `configuration` `for` `the` `bulk` `requests;` `this` `instructs` `the` `sink` `to` `emit` `after` `every` `element,` `otherwise` `they` `would` `be` `buffered`
        `esSinkBuilder.setBulkFlushMaxActions(1);`

`//` `provide` `a` `RestClientFactory` `for` `custom` `configuration` `on` `the` `internally` `created` `REST` `client`
`//`        `esSinkBuilder.setRestClientFactory(`
`//`                `restClientBuilder` `->` `{`
`//`                    `restClientBuilder.setDefaultHeaders(...)`
`//`                    `restClientBuilder.setMaxRetryTimeoutMillis(...)`
`//`                    `restClientBuilder.setPathPrefix(...)`
`//`                    `restClientBuilder.setHttpClientConfigCallback(...)`
`//`                `}`
`//`        `);`

        `source.addSink(esSinkBuilder.build());`

        `env.execute("flink-es");`
    `}`
`}`
`
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