Comment 1 for bug 1750009

Per https://www.loc.gov/marc/bibliographic/bd490.html and http://www.loc.gov/standards/mods/v3/mods-mapping.html#relateditem the indexing seems to be doing what the rules say, and indexing the 8xx instead of the 490 when the latter is traced.

I believe the real bug here is that we're generating a series search link for data we're not indexing (a traced 490). As it happens, I'm working on bug 1744385 which incidentally addresses this by only generating links for things that we actually pull out of records and store for search. It does this by leveraging the display field infrastructure (which is bound to index definitions) instead of hard-coding XPath in the OPAC templates that doesn't necessarily map to what we index.