Make properties optional (#2401)

(cherry picked from commit e66a88c)

Author: stevejgordon

output/openapi/elasticsearch-serverless-openapi.json

@@ -88,11 +88,11 @@ export class NoriTokenizer extends TokenizerBase {
 
 export class PathHierarchyTokenizer extends TokenizerBase {
   type: 'path_hierarchy'
-  buffer_size: Stringified<integer>
-  delimiter: string
+  buffer_size?: Stringified<integer>
+  delimiter?: string
   replacement?: string
-  reverse: Stringified<boolean>
-  skip: Stringified<integer>
+  reverse?: Stringified<boolean>
+  skip?: Stringified<integer>
 }
 
 export class PatternTokenizer extends TokenizerBase {