docs: update documentation for JavaScriptUDF to indicate that the message_id metadata field is optional instead of required

Google APIs · copybara-github · commit c260e248c64f · 2025-03-28T08:42:49.000-07:00
PiperOrigin-RevId: 741537524
diff --git a/google/pubsub/v1/pubsub.proto b/google/pubsub/v1/pubsub.proto
@@ -702,7 +702,7 @@ message JavaScriptUDF {
   //   *
   //   * @param  {Object<string, any>} metadata - Pub/Sub message metadata.
   //   * Keys:
-  //   *   - (required) 'message_id'  : {string}
+  //   *   - (optional) 'message_id'  : {string}
   //   *   - (optional) 'publish_time': {string} YYYY-MM-DDTHH:MM:SSZ format
   //   *   - (optional) 'ordering_key': {string}
   //   */
