Collapse Results
You can configure the Query Fields stage to collapse search results based on a field, such as 
product_id, to group all variations of each item into a single search result.
This is useful for ecommerce sites where you want to show a single product with multiple SKUs or variations.
You can also control how Managed Fusion selects the variation that represents the collapsed group; the default is the one most relevant to the user’s query.
For example, a user who searches for “red shoes” sees all of the red variations of shoes first, with the option to drill down and see all the variations.