The problem
The same goods had to be findable from a website, a marketplace, and the systems behind physical stores. One similarity function was not honest about every field.
The approach
I worked the relevancy of that backend, including similarity chosen for the field type, and moved the search platform across Solr versions and onto AWS.
The conclusion
Omnichannel is a relevance problem before it is a channel problem. The field knows what 'close' means. The ranker has to follow.