Define a search index in the Resource configuration

[bastihilger]

It would be great if we could define a search index, maybe like so in config/runway.php:

'resources' => [
    \App\Models\Product::class => [
        'search_index' => 'products',
   ],
],

That we then could use like so in config/statamic/search.php:

'indexes' => [
    //...

    'products' => [
        'driver' => 'algolia',
        'searchables' => ['runway:product'],
        'fields' => ['title'],
    ],
],

[duncanmcclean]

Added in #524, which has been released in v7.5.0.