[ML] Update JSON schemas for code editors (#207706)

## Summary

- Updates the default path to the openapi file 
- Updates JSON schemas for ML and Transform code editors with the latest
changes from elasticsearch-specification

x-pack/platform/packages/private/ml/json_schemas/README.md

@@ -1,3 +1,27 @@
 # @kbn/json-schemas
 
-JSON schema for code editors in Kibana
+This package provides JSON schemas used by code editors within the Kibana app.
+
+## Generating/Updating the JSON Schema
+
+To generate or update the output JSON schema files, run the following command from the root directory of the package:
+
+```bash
+yarn run jsonSchema
+```
+
+By default, this command assumes that your `elasticsearch-specification` folder is located next to the Kibana repository. If your `elasticsearch-specification` folder is located elsewhere, you can specify the path to the OpenAPI file as a command-line argument:
+
+```bash
+yarn run jsonSchema /path/to/elasticsearch-specification/output/openapi/elasticsearch-serverless-openapi.json
+```
+
+### Example:
+
+```bash
+yarn run jsonSchema /Users/my_user/dev/elasticsearch-specification/output/openapi/elasticsearch-serverless-openapi.json
+```
+
+This will generate or update the necessary JSON schema files in the `./src` folder.
+
+Once the changes are made, ensure they are reviewed and merged to the appropriate release version. 

x-pack/platform/packages/private/ml/json_schemas/src/json_schema_service.ts

@@ -46,6 +46,8 @@ export class JsonSchemaService {
       '..',
       '..',
       '..',
+      '..',
+      '..',
       'elasticsearch-specification',
       'output',
       'openapi',