feat(specs): add missing message attribute to GetObjectsResponse [skip-bc] (#4029)

Author: kombucha

specs/search/paths/objects/getObjects.yml

@@ -61,6 +61,10 @@ post:
             type: object
             additionalProperties: false
             properties:
+              message:
+                type: string
+                description: An optional status message.
+                example: Index INDEX_NAME does not exist.
               results:
                 type: array
                 description: Retrieved records.