[BUG] TypeError on flowFramework create API call

[MattyChance]

What is the bug?

Opensearch FlowFramework does not seem to respect the required type of body defined in the lib.

export type FlowFrameworkCreate = {
  description?: string;
  name: string;
  use_case?: string;
  version?: version;
  workflows?: Record<string, any>;
}

How can one reproduce the bug?

Just create an AwsSigv4Auth opensearch client and use the client api:

        const sigV4Client = new Client({
            auth: {
                credentials: {
                    accessKeyId: my_accessKeyId,
                    secretAccessKey: my_secretKey,
                    sessionToken: my_sessionToken,
                },
                region: 'us-region',
                service: 'es',
            },
            node: myNode
        });

        await sigV4Client.flowFramework.create({ body });

What is the expected behavior?

As long as the body is in the required format, it should work.

I looked into the library code and it seems like the body object is not serialized but i am unable to find out how the libraries are deciding what to serialized.

What is your host/environment?

MacOS 14.4.1
Node 20
Opensearch 3.0.0

Do you have any screenshots?

Do you have any additional context?

Add any other context about the problem.