[Backport 3.5] Another TPCH fix: Wait for all shards

[opensearch-trigger-bot]

Backport 8073b4e from #5106.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch backport/backport-5106-to-3.5

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