Search cross multiple index

[Romer4ig]

I see in old PR and found code. rewrite it to current state for use within() Scout function as example

MixedSearch::search()->within(implode(',', [
    (new Movie())->searchableAs(),
    (new Series())->searchableAs(),
    (new Trailer())->searchableAs(),
]))->get();

[Jeroen-G]

What does it do and how should I test it? 🤔

[Romer4ig]

What does it do and how should I test it? 🤔
This functionality is inspired by the official Elasticsearch documentation available at https://www.elastic.co/guide/en/elasticsearch/reference/current/search-multiple-indices.html.
Additionally, I found a similar example in another library at https://github.com/matchish/laravel-scout-elasticsearch?tab=readme-ov-file#search-amongst-multiple-models.
As I mentioned earlier, there was a request to implement such functionality in another pull request.
The expected test scenario involves creating two indices from two different models. The search operation should return corresponding entities from these two different tables.