I found this this topic where the users asks about how to set searchable attributes for a specific search. The response goes on to say that can only be done via the backend and not for a specific search.
The instantsearch.js code you pasted in you message is intended to only perform search operations and no indexing operations. And you can only restrict searchable attribute there - that one is correct.
So in order to make it work, you need to move the setting of
searchableAttributesto your backend where you index your data and create your indices.
In the documentation I found a restrictSearchableText attribute that does appear to be able to be set for a specific search however I can’t find any info about how to set this in the (react)
I also found this reference that indicates that it can be done for the Angular version, so I assume it can also be done for the react version.