Elasticsearch返回0结果

Question

我在我的电脑上安装了弹性搜索，我将fos_elastica软件包添加到我的symfony3项目中并进行了配置。 填充我的数据后

bin/console fos:elastica:populate

执行搜索请求时，它总是返回0结果（空数组）：[] 这是我的fos_elastica.yml文件

> fos_elastica:
>     clients:
>         default: { host: %elastic_host%, port: %elastic_port% }
>     indexes:
>         app:
>             client: default
>             types:
>                 user:
>                     mappings:
>                         username: ~
>                         email: ~
>                     persistence:
>                         # the driver can be orm, mongodb, phpcr or propel
>                         # listener and finder are not supported by
>                         # propel and should be removed
>                         driver: orm
>                         model: Appbundle\Entity\User
>                         provider: ~
>                         listener: ~
>                         finder: ~
>                 post:
>                     mappings:
>                         id:
>                             type: integer
>                         title : ~
>                         body : ~
>                     persistence:
>                         driver: orm
>                         model: Appbundle\Entity\Post
>                         finder: ~
>                         provider: ~
>                         listener: ~

这是我在我的控制器中的功能：

/**
 * @Route("/post/searchfind",name="postsearchfind")
 */
public function findAction()
{
    $finder = $this->container->get('fos_elastica.finder.app.post');
    // Option 1. Returns all users who have mm in any of their mapped fields
    $results = $finder->find('a');
    var_dump($results);
    return new JsonResponse($results);
}

请帮忙，对不起英语！