How Faceted Search Actually Works in Elasticsearch (And Where It Breaks)
A facet is not a UI widget, it is a question answered twice per page: which results match, and how many would match for every other value on offer. Here is how Elasticsearch answers both in one pass, and the two ways…
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PrestaShop Product Filters: Why The Number Next To A Filter Sometimes Does Not Add Up
A shopper ticks a filter that promises 12 results and gets 8, or the other way round. It is not a UI quirk, it is one of the most common problems in faceted search, and on a large catalog it has a very real cost in…
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