KeyError: 'requestBody' : File "/var/task/lambda_function.py", line 15, in get_named_property event['requestBody']['content']['application/json']['properties']

Hi,

I'm testing "create an action group" for a bedrock agent that can call a lambda function. Creating this action group calls for having an OpenAPI schema which defines the function endpoints, required arguments, and the returns.

However, I'm seeing the following error

```
LAMBDA_WARNING: Unhandled exception. The most likely cause is an issue in the function code. However, in rare cases, a Lambda runtime update can cause unexpected function behavior. For functions using managed runtimes, runtime updates can be triggered by a function change, or can be applied automatically. To determine if the runtime has been updated, check the runtime version in the INIT_START log entry. If this error correlates with a change in the runtime version, you may be able to mitigate this error by temporarily rolling back to the previous runtime version. For more information, see https://docs.aws.amazon.com/lambda/latest/dg/runtimes-update.html

[ERROR] KeyError: 'requestBody'
Traceback (most recent call last):
File "/var/task/lambda_function.py", line 97, in lambda_handler
internal_id = get_named_property(event, "internalId")
File "/var/task/lambda_function.py", line 15, in get_named_property
event['requestBody']['content']['application/json']['properties']
```

Can someone please look into this?

Start with lambda_function.py, especially get_named_property and lambda_handler, and compare the Bedrock action group's event shape with the code's requestBody access. Reproduce the action-group invocation using the OpenAPI schema described in the issue; done means the handler no longer raises the reported KeyError for that event.

Written by the indexing model from the issue text.