es 6.3.1版本与5.6.1版本之间有什么区别？spring boot集成6.3.1时为什么会报错而5.6.1不会？

spring boot项目集成elasticsearch 6.3.1的时候，用maven package打包时会报如下错误：
 
Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'esTest': Unsatisfied dependency expressed through field 'client'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'client' defined in class path resource [com/oo_1010/demo/elasticsearch/EsConfig.class]: Bean instantiation via factory method failed; 
nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.elasticsearch.client.transport.TransportClient]: Factory method 'client' threw exception; 
nested exception is java.lang.NoClassDefFoundError: org/elasticsearch/script/ScriptEngine
 
这是我的配置文件pom.xml对es的配置：

<dependency> 
<groupId>org.elasticsearch.client</groupId> 
<artifactId>transport</artifactId> 
<version>6.3.1</version> 
</dependency>
 
而当我把上面配置文件es的版本换为5.6.1时，maven打包不再报错，打包的jar报在命令行下用java -jar命令也能正常地跑起来了
这两个版本之间有什么区别吗