Take subset tags into account during search

[matentzn]

New feature description.

For better or worse, subsets have been used for a variety of use cases (from defining upper levels in ontologies, to creating domain specific subsets, to external stakeholder usage. Mondo for example has a rich variety of subsets, including: rare, nord_rare, otar, clingen, disease_grouping, subtype etc. Uberon makes extensive use of subsets as well, relevant to groups such as hubmap or hca. I would like to ask, without really being 100% sure that I thought this through, to make it possible to index the subset remainders and take them into account during search.

Use cases

The subsets provide a load of search signal. For example, the keyword "rare" will make it possible to discover a rare disease even if the fact is not recorded anywhere else in the text. Similar, if you look for "nord", you will find diseases which related to the NORD organisation (which was requested by the NORD organisation for example).

User communities

• Monarch
• NORD

Describe the solution you'd like

Subsets are formatted like this:

• http://purl.obolibrary.org/obo/mondo#nord_rare
• http://purl.obolibrary.org/obo/mondo#otar
• http://purl.obolibrary.org/obo/uberon#hra_subset

So I would like, at least weakly, that a user typing nord would be able find terms in the nord_rare subset. Right now the index only returns classes that have a NORD xref when you search:

Describe alternatives you've considered

None.

Additional context

My biggest worry with this request is that OLS currently does not have a way to display how the hit was established. In particular, the autocomplete field does not show the field where the hit was done, like say Protege does:

This may confuse some people.