Bug when using the event editor with Azure OpenAI connector on Elastic Cloud

[iTiagoCO]

Kibana version:
8.15.4

Elasticsearch version:
8.15.4

Server OS version:
GCP - South Carolina (us-east1)

Browser version:
Google Chrome
Versión 131.0.6778.86 (Build oficial) (64 bits)

Browser OS version:
Windows 10

Original installation method (e.g., download page, yum, from source, etc.):
Elastic Cloud

Describe the error:
When setting up an Azure OpenAI connector in Kibana and performing a query related to a hostname, if you try to expand an event in the corresponding section and then click on the event editor, Kibana throws an unexpected error that logs you out or reloads the page.

Steps to reproduce:

Set up an Azure OpenAI connector in Kibana.
Perform a query related to a hostname.
Expand the events resulting from the query.
Click on the event editor.
Expected behavior:
The event editor should open successfully to allow editing or review of the selected event without errors or interruptions.

Screenshots (if applicable):

Logs
logs.txt

Errors in browser console (if applicable):
[If possible, include relevant browser console messages that can help diagnose the issue.]

Provide server logs or output (if applicable):
[If you have access, include relevant server or Kibana logs that can provide more details about the error.]

Any additional context:

This issue occurs specifically on Elastic Cloud, version 8.15.4, with the Azure OpenAI connector.

[elasticmachine]

Pinging @elastic/obs-ai-assistant (Team:Obs AI Assistant)

[sorenlouv]

I was able to reproduce the error. Afaict the error is thrown because functionDefinition.parameters is undefined.

kibana/x-pack/packages/kbn-ai-assistant/src/hooks/use_json_editor_model.ts

Line 46 in 8f12d52

: functionDefinition.parameters.properties

use_json_editor_model.ts:38 Uncaught TypeError: Cannot read properties of undefined (reading 'properties')
    at use_json_editor_model.ts:38:1
    at updateMemo (react-dom.development.js:15867:1)
    at Object.useMemo (react-dom.development.js:16413:1)
    at useMemo (react.development.js:1532:1)
    at useJsonEditorModel (use_json_editor_model.ts:30:1)
    at PromptEditorFunction (prompt_editor_function.tsx:40:1)
    at renderWithHooks (react-dom.development.js:14985:1)
    at updateFunctionComponent (react-dom.development.js:17356:1)
    at beginWork (react-dom.development.js:19063:1)
    at HTMLUnknownElement.callCallback (react-dom.development.js:3945:1)