advanced select ajax

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So i took a look on MB Relationships plugin, but i have a big problem with those selects.

I have a post type called “serie” and a post type called “episode”
The problem is that, i have 10k+ series and 200k+ episodes

1 serie has many episodes (up to 2k)
1 episode has 1 serie (but on select i see all 10k)

I saw this post: https://metabox.io/support/topic/clonable-select_advanced-with-ajax/

but i can’t understand if that code will work for relationship advanded selects, and where i need to put that code?

It would be nice that select-advanced had an options that forces user to type something, and then ajax will query DB to find the custom post that matches the search.