Statistical (histogram) information about categories that contain items that match the query, if any. For categories associated with specific items, see items returned in each search result. Shows the distribution of items across each category. Not returned if there is no match.
Container for histogram information pertaining to a child of the category specified in the request. Histograms return data on up to 10 children. Histograms are only a single level deep. That is, a given category histogram contains only immediate children.
See the Field Index to learn which calls use childCategoryHistogram.