failed to load plugin

failed to load plugin from [file:/root/yinjj/elk/opt/es/plugins/search-guard/es-plugin.properties]

org.elasticsearch.ElasticsearchException: Failed to load plugin class [com.floragunn.searchguard.SearchGuardPlugin]

at org.elasticsearch.plugins.PluginsService.loadPlugin(PluginsService.java:536)

at org.elasticsearch.plugins.PluginsService.loadPluginsFromClasspath(PluginsService.java:411)

at org.elasticsearch.plugins.PluginsService.(PluginsService.java:116)

at org.elasticsearch.node.internal.InternalNode.(InternalNode.java:154)

at org.elasticsearch.node.NodeBuilder.build(NodeBuilder.java:159)

at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:77)

at org.elasticsearch.bootstrap.Bootstrap.main(Bootstrap.java:245)

at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:32)

Caused by: java.lang.NoClassDefFoundError: javassist/ClassPool

at com.floragunn.searchguard.SearchGuardPlugin.(SearchGuardPlugin.java:90)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:526)

at org.elasticsearch.plugins.PluginsService.loadPlugin(PluginsService.java:518)

… 7 more

Caused by: java.lang.ClassNotFoundException: javassist.ClassPool

at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at java.lang.ClassLoader.loadClass(ClassLoader.java:425)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)

at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

… 13 more