[BUG] Default config file causes initial indexing to fail

[kudlohlavec]

Describe the bug
After publishing of config file and running import command, there is an error that is probably caused by deprecated usage of type attribute. As it can be seen at official elasticsearch docs.

To Reproduce
Steps to reproduce the behavior:

1. Publish config with php artisan vendor:publish --tag config
2. Run indexing command php artisan scout:import
3. Get error: Root mapping definition has unsupported parameters

Expected behavior
Successful indexing

Additional context
I also tried to remove type attribute from default mapping, what seems to solve unsupported parameters error, however it yielded another error: java.util.ArrayList cannot be cast to java.util.Map. According to google, that error often comes up when some empty field is being passed into elasticsearch. So it looks like there needs some other alteration in the config structure to be done.

What is more, when I have removed overall mappings part, indexing has been finished successfully without any problems. I am using v7.6.1 of elasticsearch-php.

Original config that resulted in unsupported parameters error:

return [
    'host' => env('ELASTICSEARCH_HOST'),
    'indices' => [
        'mappings' => [
            'default' => [
                'properties' => [
                    'id' => [
                        'type' => 'keyword',
                    ],
                ],
            ],
        ],
        'settings' => [
            'default' => [
                'number_of_shards' => 1,
                'number_of_replicas' => 0,
            ],
        ],
    ],
];

Edited config that resulted in java.util.ArrayList error:

return [
    'host' => env('ELASTICSEARCH_HOST'),
    'indices' => [
        'mappings' => [
            'default' => [
                'properties' => [
                    'id' 
                ],
            ],
        ],
        'settings' => [
            'default' => [
                'number_of_shards' => 1,
                'number_of_replicas' => 0,
            ],
        ],
    ],
];

Config that resulted in successful indexing:

return [
    'host' => env('ELASTICSEARCH_HOST'),
    'indices' => [
        'settings' => [
            'default' => [
                'number_of_shards' => 1,
                'number_of_replicas' => 0,
            ],
        ],
    ],
];