chore: backport federated search fix

[Strift]

Pull Request

Related issue

Fixes #685 on v1.x branch

What does this PR do?

• Backport Cast federation payload explicilty to an object #757 to v1.x branch

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/backport-federated-search-fix

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