sprintBoot 连接ES出现错误

错误为：

java.lang.ClassNotFoundException: org.elasticsearch.plugins.NetworkPlugin

原因是：没有导入这个依赖，导入就行了

<dependency>    <groupId>org.elasticsearch</groupId>    <artifactId>elasticsearch</artifactId>    <version>5.6.1</version></dependency>

我的完整依赖为：

parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.9.RELEASE</version>        <relativePath /> <!-- lookup parent from repository -->    </parent>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>        <java.version>1.8</java.version>        <log4j.version>2.7</log4j.version>    </properties>    <dependencies>        <!-- 修改之后可以实时生效 -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>            <optional>true</optional>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter</artifactId>        </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-starter-web</artifactId>        </dependency>        <!-- elasticSearch <dependency> <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-data-elasticsearch</artifactId> </dependency> -->        <!-- https://mvnrepository.com/artifact/org.elasticsearch.client/transport -->        <dependency>            <groupId>org.elasticsearch.client</groupId>            <artifactId>transport</artifactId>            <version>5.6.1</version>        </dependency>        <!-- https://mvnrepository.com/artifact/org.elasticsearch/elasticsearch -->        <dependency>            <groupId>org.elasticsearch</groupId>            <artifactId>elasticsearch</artifactId>            <version>5.6.1</version>        </dependency>        <!-- 日志log4j -->        <dependency>            <groupId>org.apache.logging.log4j</groupId>            <artifactId>log4j-api</artifactId>            <version>${log4j.version}</version>        </dependency>        <dependency>            <groupId>org.apache.logging.log4j</groupId>            <artifactId>log4j-core</artifactId>            <version>${log4j.version}</version>        </dependency>        <dependency>            <groupId>org.apache.logging.log4j</groupId>            <artifactId>log4j-web</artifactId>            <version>${log4j.version}</version>        </dependency>    </dependencies>