使用TransportClient操作ElasticSearch5.2

1.官网地址

  https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/java-docs-get.html

2.环境准备，添加Maven依赖

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>transport</artifactId>
    <version>5.2.2</version>
</dependency>

2.简单连接测试

// on startup
 TransportClient client =newPreBuiltTransportClient(Settings.EMPTY)

.addTransportAddress(newInetSocketTransportAddress(InetAddress.getByName("host1"),9300))

.addTransportAddress(newInetSocketTransportAddress(InetAddress.getByName("host2"),9300));

// on shutdown

client.close();

   测试结果失败，报错。

   Unsupported major.minor version 52.0

   解决方案，切换jdk版本为1.8

   持续报错

   Exception in thread "main" java.lang.NoSuchFieldError: FAIL_ON_SYMBOL_HASH_OVERFLOW

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   引入maven依赖

   <dependency> 
        <groupId>com.fasterxml.jackson.core</groupId> 
         <artifactId>jackson-core</artifactId> 
          <version>2.8.1</version> 
   </dependency>

   持续报错

   Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.Logger

   这个错误很明显 log4j jar包缺失的错误

  <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-core</artifactId>
        <version>2.6.2</version>
        </dependency>
        <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-api</artifactId>
        <version>2.6.2</version>
        </dependency>
        <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-1.2-api</artifactId>
        <version>2.6.2</version>
   </dependency>

   问题得到解决，测试通过！！！

4.GET查询（通过ID查询一条记录）

 

GetResponse response = client.prepareGet("twitter","tweet","1").setOperationThreaded(false).get();

 上边是官方API示例。如果想打印值，可以调用response.getSource()方法，得到一个Map