Can be returned if the request specifies that ExpandSearch is true. Provides additional search results when a small result set would have been returned with the original search. For example, on the US site (site ID 0), if a search would normally result in fewer than 10 items, and ExpandSearch is true, the search results are expanded to include (if matching the query) the FilterRemovedExpansionArray container for items, as well as other containers. The FilterRemovedExpansionArray container contains items that would be returned if filters such as PriceRangeFilter are removed.
See the
Field Index to learn which calls use FilterRemovedExpansionArray.