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  • I have tried that "search first then upsert" approach. But it was no difference. So thank you so much.. anyway, I will put the index in that field is my last chance. Commented Dec 18, 2019 at 20:34
  • No, not search-then-upsert, only upsert. Upsert is atomic. search-then-upsert is not. Commented Dec 18, 2019 at 20:37