写了一个elasticsearch插件，然后请求的时候报错！

在es5.1.1版本中添加了一个自定义的插件，但是请求这个api的时候报错了！报错如下：
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"No endpoint or operation is available at [_mytest1]"}],"type":"illegal_argument_exception","reason":"No endpoint or operation is available at [_mytest1]"},"status":400}