Contains {facet-name} objects to define each facet you want to return with
search results.
The Search Service supports the following facet types:
→ Term Facet: Counts the documents that have the same value for a specified field.
→ Numeric Range Facet: Counts the documents with numeric field values that are greater than or
less than a specified range or ranges.
→ Date Range Facet: Counts the documents with date field values that are earlier or later than a
specified range or ranges.