[Backport 2.19-dev] Convert `dedup` pushdown to composite + top_hits (#4844) #4878

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Merged

LantaoJin merged 3 commits into opensearch-project:2.19-dev from LantaoJin:backport/backport-4844-to-2.19-dev

Nov 28, 2025

Merged

[Backport 2.19-dev] Convert `dedup` pushdown to composite + top_hits (#4844) #4878

fix the field order issue in 2.19

DCO / DCO succeeded Nov 27, 2025 in 1s

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