To make your changes permanent, just create your own copy of the class directly in extend.php or in a custom namespace registered in the root compose.json, then register it using a local extender.
Something like this (I did not test the code):
<?php
use Flarum\Extend;
use Flarum\Discussion\Search\DiscussionSearcher;
use Flarum\Search\GambitInterface;
use Flarum\Search\SearchState;
class MyFulltextGambit implements GambitInterface
{
public function apply(SearchState $search, $bit)
{
// your logic
}
}
return [
(new Extend\SimpleFlarumSearch(DiscussionSearcher::class))
->setFullTextGambit(MyFulltextGambit::class),
];
Post Stream Search doesn't change the way the search works. It creates a separate searcher class for posts. The default SQL was copied from the discussion searcher. If you do use Post Stream Search and customized the discussion fulltext gambit, you will also need to separately customize the post fulltext gambit.
Or alternatively if this makes sense, you can use Scout Search, which overrides both of these fulltext gambits to use one of Scout supported search drivers instead.
