How would you design a RedisSearch based product search feature that supports faceted filtering, such as showing available categories and their counts alongside search results?

You would use RedisSearch's aggregation capabilities through the FT.AGGREGATE command, grouping matched results by category and counting occurrences within each group, letting you display both the actual search results and a summary of available filter categories with counts, similar to what you commonly see on major e-commerce search pages.

FT.AGGREGATE product_idx '@name:laptop' GROUPBY 1 @category REDUCE COUNT 0 AS count