Here is the diff between stable/8.0.6_bcgov_12377 in Arches and what I have added to (and monkey-patched in) BCAP. I have NOT included the monkey-patch (which involves updating bcap/apps.py):
https://www.diffchecker.com/M3qtUzkT/

Here is apps.py, if you want to test it out:

from django.apps import AppConfig


class BcapConfig(AppConfig):
    name = "bcap"
    is_arches_application = True

    def ready(self):
        from arches.app.search.components import term_filter
        from bcap.search_components.term_filter import TermFilter
        term_filter.TermFilter = TermFilter

I used: git log -p --all -S "displayname.value" -- "**/*.py" to search through the Arches repository. I found that there existed:

boolquery.should(
    Match(field="displayname.value", query=searchString, fuzziness=2, boost=2)
)

on August 13, 2024 which added displayname search in commit f7f3525. On May 29, 2025, it was removed during a refactor in commit b15a6d5. The line was deleted when the code was reorganized.

However, this was for the search dropdown autocomplete, not the actual term filter that executes the "Contains Term" search. Our fix adds displayname search to the term filter in bcap/search_components/term_filter.py.