For reference: Declining this was partly based on conversations we had with the Discovery-Search team. While it is technically possible to change the CirrusSearch index to give TemplateData descriptions a much higher priority – or introduce a new index that does this – it's very high effort for a secondary feature like this. It's also rather unlikely that doing this will significantly improve the quality of the search results. Cirrus already indexes all text it finds in the template's documentation. Words that are highly relevant to understand what a template is about probably appear multiple times on the page – not only in the TemplateData description – and will be ranked high anyway.

We are also told that the existing Cirrus index is a delicate piece of art meant to please a very general audience. It's very unlikely that it will be changed for a special use case like this. If we really want it, it will most probably be a separate index, which WMDE would need to maintain. This is just not sustainable.