Allow to define several local search indexes, including standard MARC fields
Following the partial implementation of idea "Ability to search via free text MARC tag and subfields" (https://ideas.exlibrisgroup.com/forums/308173-alma/suggestions/17197337-ability-to-search-via-free-text-marc-tag-and-subfi) under NERS 2020 #6795, here is perhaps a more modest suggestion, that hopefully can be more technically feasible and still provide a large chunk of the missing functionality.
Similar to the analytics "Local Param" concept, it would be very helpful if institutions were able to define 5-10 "Local Search Indexes", based on each institution's needs. These indexes should be able to include any MARC field or subfield, whether local or standard (and preferably also field combinations).
Use case: In our institution, we would like to be able to search by the currently unindexed standard MARC fields/subfields of 300a and 506a, and perhaps also by 773 separately (without other fields interfering).
Allowing every institution to search by any field/subfield is obviously very ambitious on a technical perspective. But is it possible to allow each institution to choose several key fields for indexing, that would most be helpful to it's workflows?