ElasticSearch 5.4 客户端访问常见问题

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0 概述

本文主要阐述 ElasticSearch 5.4 客户端模式进行开发的时候出现的问题~依赖 maven pom

        <!-- ES -->        <dependency>            <groupId>org.elasticsearch</groupId>            <artifactId>elasticsearch</artifactId>            <version>5.4.0</version>        </dependency>        <dependency>            <groupId>org.elasticsearch.client</groupId>            <artifactId>transport</artifactId>            <version>5.4.0</version>        </dependency>

1 常见问题以及处理

1.1 jdk版本问题

出现unsorportedClassVersion等类似问题。由于elasticsearch 5.0 以及以后版本使用了java lambda表达式等相JDK相关特性，因此jdk 版本必须是1.8 以上版本（含1.8）。

1.2 出现log4j相关异常

    at org.elasticsearch.common.logging.Loggers.getLogger(Loggers.java:105)    at org.elasticsearch.common.logging.Loggers.getLogger(Loggers.java:72)    at org.elasticsearch.common.component.AbstractComponent.<init>(AbstractComponent.java:37)    at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:110)    at org.elasticsearch.client.transport.TransportClient.newPluginService(TransportClient.java:92)    at org.elasticsearch.client.transport.TransportClient.buildTemplate(TransportClient.java:117)    at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:241)    at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:92)    at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:81)    at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:71)    at com.hsc.study.ESClient.<init>(ESClient.java:21)    at com.hsc.study.ESClient.main(ESClient.java:26)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)    at java.lang.reflect.Method.invoke(Method.java:483)    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

项目中缺少log4j2 依赖，这个是es5.4 强依赖~
解决办法：添加如下依赖

       <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-core</artifactId>            <version>2.6.2</version>        </dependency>

1.3 修改配置中集群名字后启动失败

Exception in thread "main" ElasticsearchParseException[malformed, expected settings to start with 'object', instead was [VALUE_STRING]]    at org.elasticsearch.common.settings.loader.XContentSettingsLoader.load(XContentSettingsLoader.java:73)    at org.elasticsearch.common.settings.loader.XContentSettingsLoader.load(XContentSettingsLoader.java:52)    at org.elasticsearch.common.settings.loader.YamlSettingsLoader.load(YamlSettingsLoader.java:50)    at org.elasticsearch.common.settings.Settings$Builder.loadFromStream(Settings.java:925)    at org.elasticsearch.common.settings.Settings$Builder.loadFromPath(Settings.java:914)    at org.elasticsearch.node.internal.InternalSettingsPreparer.prepareEnvironment(InternalSettingsPreparer.java:102)    at org.elasticsearch.bootstrap.Bootstrap.initialEnvironment(Bootstrap.java:257)    at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:297)    at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121)    at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112)    at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54)    at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:122)    at org.elasticsearch.cli.Command.main(Command.java:88)    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:89)    at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:82)

yml的配置文件中冒号后边要跟有一个空格，不要出现tab符,如下：
cluster.name: test

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