An estimate of the number of result items matching both the current query and
the filter expression that would get generated if the facet value were selected.
displayValue
displayValue:string
The custom facet value display name, as specified in the captions argument of the facet request.
rawValue
rawValue:string
The original facet value, as retrieved from the field in the index.
An estimate of the number of result items matching both the current query and the filter expression that would get generated if the facet value were selected.