add historical filters

Author: bengreenbank

specs/realtime-personalization/common/schemas/user.yml

@@ -42,3 +42,8 @@ searchFilter:
       items:
         type: string
       example: ['brand:Dyson<score=12>']
+    historical:
+      type: array
+      items:
+        type: string
+      example: ['brand:Dyson<score=12>', 'category:electronics<score=5>']