Allow users to determine the order in which indexes are processed

Thanks for creating this ticket!

However, my feeling is that this is much too niche of a feature for inclusion in this module. (I also don’t really understand how changing the order would make the page request go any faster?)
If this is just about “immediate” indexing on editing an entity, then you can work around this problem with custom code on your site by overriding the search_api.post_request_indexing service and just ordering $this->operations as desired at the top of the destruct() method (before calling the parent method).

Anyways, in case you’d still prefer a solution within this module, I’m gonna leave this ticket open to see if others express interest, too. If so, we can revisit.