Unable to use multiple models as index in laravel elastic search

I am using laravel elastic search package. In Scout.php file. I am giving index laravel which is working with one model staff but not working with other models.

scout.php

 'elasticsearch' => [
        'index' => env('ELASTICSEARCH_INDEX', 'laravel'),
        'config' => [
            'hosts' => [
                env('ELASTICSEARCH_HOST', 'http://localhost'),
            ],
        ],

In models i am using

 public function searchableAs()
    {
        return 'customer';
    }

When Give customer in scoute.php index then it works fine. but i wan to use it for all models

via Chebli Mohamed