HUE-2218 [search] Backend for getting the stats and terms of a field
HUE-2300 [search] Pivot facet backend and front end logic
HUE-2315 [search] Extra call to /search on facet semi modal show

Put back filter template removed by error
[search] Missing remove call on widget

Deleting a widget was not removing it from the model
[search] Delete widgets when deleting a new column
[search] Refresh dashboard when deleting a widget that had some filters