[ML] Change format for Unified Chat error responses (#121396) #121829
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Unified Chat Completion error responses now forward code, type, and param to in the response payload.
reasonhas been renamed tomessage.Notes:
XContentFormattedExceptionis aChunkedToXContentso that the REST listener can calltoXContentChunkedto format the output structure. By default, the structure forwards to our existing ES exception structure.UnifiedChatCompletionExceptionwill override the structure to match the new unified format.Throwableis aError, we rethrow it on another thread so the JVM can catch and handle it. We also stop surfacing the JVM details to the user in the error message (but it's still logged for debugging purposes).