Fix schema of custom fields in query for appservice API (#1584)

* Fix schema of custom fields in query for appservice API

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

* Add changelog

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

* Remove ellipses

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

---------

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

changelogs/application_service/newsfragments/1584.clarification

@@ -0,0 +1 @@
+Fix JSON schema of custom fields in query.

data/api/application-service/protocols.yaml

@@ -96,12 +96,14 @@ paths:
           schema:
             type: string
         - in: query
-          name: fields...
+          name: fields
           description: |-
             One or more custom fields that are passed to the application
             service to help identify the user.
           schema:
-            type: string
+            type: object
+            additionalProperties:
+              type: string
       responses:
         "200":
           description: The Matrix User IDs found with the given parameters.
@@ -161,12 +163,14 @@ paths:
           schema:
             type: string
         - in: query
-          name: fields...
+          name: fields
           description: |-
             One or more custom fields that are passed to the application
             service to help identify the third-party location.
           schema:
-            type: string
+            type: object
+            additionalProperties:
+              type: string
       responses:
         "200":
           description: At least one portal room was found.

data/api/client-server/third_party_lookup.yaml

@@ -139,11 +139,13 @@ paths:
           schema:
             type: string
         - in: query
-          name: fields...
+          name: fields
           description: One or more custom fields that are passed to the AS to help
             identify the user.
           schema:
-            type: string
+            type: object
+            additionalProperties:
+              type: string
       responses:
         "200":
           description: The Matrix User IDs found with the given parameters.