[Obs AI Assistant] Error when fetching alerts

[viduni94]

Describe the bug:
Fetching alerts via the Obs AI Assistant is not working after

Steps to reproduce:

1. Open the Obs AI Assistant
2. Trigger some alerts by setting up an alerting rule
3. Type in prompt - "How many alerts do I have in the past 10 days?"
4. Notice the error in the alerts function call

Expected behavior:
The alerts function call should be able to query the alerts successfully.

Screenshots (if relevant):

Errors in browser console (if relevant): N/A

Provide logs and/or server output (if relevant):

[2024-12-09T10:46:46.926-05:00][DEBUG][plugins.observabilityAIAssistant.service] Added message: {"@timestamp":"2024-12-09T15:46:46.925Z","message":{"content":"","function_call":{"name":"alerts","arguments":"{\"start\":\"now-30d\",\"end\":\"now\"}","trigger":"assistant"},"role":"assistant"}}
[2024-12-09T10:46:47.473-05:00][ERROR][plugins.ruleRegistry] Unable to retrieve alert details for alert with id of "undefined" or with query "{"bool":{"filter":[{"0":{"term":{"kibana.alert.status":"active"}},"range":{"@timestamp":{"gte":1731167207080,"lte":1733759207081}}}]}}" and operation find 
Error: ResponseError: x_content_parse_exception
	Caused by:
		x_content_parse_exception: [1:174] [bool] failed to parse field [filter]
	Root causes:
		parsing_exception: unknown query [0]
[2024-12-09T10:46:47.474-05:00][ERROR][plugins.ruleRegistry] find threw an error: Error: Unable to retrieve alert details for alert with id of "undefined" or with query "{"bool":{"filter":[{"0":{"term":{"kibana.alert.status":"active"}},"range":{"@timestamp":{"gte":1731167207080,"lte":1733759207081}}}]}}" and operation find 
Error: ResponseError: x_content_parse_exception
	Caused by:
		x_content_parse_exception: [1:174] [bool] failed to parse field [filter]
	Root causes:
		parsing_exception: unknown query [0]
[2024-12-09T10:46:47.474-05:00][ERROR][plugins.observabilityAIAssistant.service] Encountered error running function alerts: {"data":null,"isBoom":true,"isServer":false,"output":{"statusCode":404,"payload":{"statusCode":404,"error":"Not Found","message":"Unable to retrieve alert details for alert with id of \"undefined\" or with query \"{\"bool\":{\"filter\":[{\"0\":{\"term\":{\"kibana.alert.status\":\"active\"}},\"range\":{\"@timestamp\":{\"gte\":1731167207080,\"lte\":1733759207081}}}]}}\" and operation find \nError: ResponseError: x_content_parse_exception\n\tCaused by:\n\t\tx_content_parse_exception: [1:174] [bool] failed to parse field [filter]\n\tRoot causes:\n\t\tparsing_exception: unknown query [0]"},"headers":{}}}

Any additional context:

• Noticing this behaviour after the merge commit a3496c9ca6d99fa301fd8ca73ad44178cdeb2955.
• The functionality works as expected for the merge commit (13caf8d7e6d11dde68a161cd0edb3046128a0de2) before this.

[elasticmachine]

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