Best Sellers can be added to your sort order configuration in Stores > Configuration > Algolia Search > Instant Search Results Page > Sorts. To add this sort order, click “Add” to add a new row and configure Attribute to
ordered_qty, and set the Sort direction as Descending.
Please note that adding this sort order adds
total_ordered attributes to your product objects, aggregated from the
sales_order_item table. This can potentially increase your indexing time.