add searchHighlight as a type

Author: nirinchev

generator/config/schema.json

@@ -184,7 +184,8 @@
                             "decimal",
                             "searchPath",
                             "searchScore",
-                            "searchOperator"
+                            "searchOperator",
+                            "searchHighlight"
                         ]
                     }
                 },

generator/config/search/in.yaml

@@ -35,6 +35,9 @@ tests:
                 birthdate: 1
       schema:
           customers: &ref_0
+              _id:
+                  types:
+                      - bsonType: ObjectId
               username:
                   types:
                       - bsonType: String

generator/config/stage/search.yaml

@@ -24,7 +24,7 @@ arguments:
     - name: highlight
       optional: true
       type:
-          - object
+          - searchHighlight
       description: |
           Specifies the highlighting options for displaying search terms in their original context.
     - name: concurrent