[oblodgett]

Summary

• Literature search facets now appear in the order curators asked for: Year, Journal (resourceTitle), Author, Reference Type.
• Year facet values are sorted newest first (terms aggregation ordered by key, descending) instead of by count.

On stage ES, publicationYear has 220 distinct values, all 4-digit years, so ordering by key is chronological and all of them fit within the facet's 999-bucket size.

The UI part of the ticket (turning off the facet search box) is alliance-genome/agr_ui#1931.

Testing

• agr_api compiles and its unit tests pass (10 tests)
• No existing test covers the literature facets

[claude]

Reviewed the change to SearchHelper. It looks correct and I found no blocking issues.

• Reordering the literature facets only changes the order of the aggregations and of the facets returned for the LITERATURE category. Filtering and the aggregation names stay the same, so the API contract doesn't change.
• BucketOrder.key(false) on publicationYear.keyword sorts years lexicographically in descending order. That gives the right result for 4-digit year strings. A year stored with a different width or format would sort out of place, which is unlikely for this data.
• With size(999), sorting by key instead of by count means that if there were ever more than 999 distinct years, the oldest years would be dropped rather than the least common ones. This doesn't matter in practice.

No performance or security concerns.