From 53230099fc21fe4c4bf60e26420ca2e839ec22f1 Mon Sep 17 00:00:00 2001
From: Nick Zolnierz <nicholas.zolnierz@mongodb.com>
Date: Wed, 14 Apr 2021 14:02:26 -0400
Subject: SERVER-55826 Disallow $count accumulator in persisted pipelines
 unless FCV is 5.0 or greater

---
 src/mongo/db/pipeline/accumulator_sum.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/mongo/db')

diff --git a/src/mongo/db/pipeline/accumulator_sum.cpp b/src/mongo/db/pipeline/accumulator_sum.cpp
index bc1eb451d9a..53cb45563dd 100644
--- a/src/mongo/db/pipeline/accumulator_sum.cpp
+++ b/src/mongo/db/pipeline/accumulator_sum.cpp
@@ -48,7 +48,8 @@ using boost::intrusive_ptr;
 REGISTER_ACCUMULATOR(sum, genericParseSingleExpressionAccumulator<AccumulatorSum>);
 REGISTER_EXPRESSION(sum, ExpressionFromAccumulator<AccumulatorSum>::parse);
 REGISTER_REMOVABLE_WINDOW_FUNCTION(sum, AccumulatorSum, WindowFunctionSum);
-REGISTER_ACCUMULATOR(count, parseCountAccumulator);
+REGISTER_ACCUMULATOR_WITH_MIN_VERSION(
+    count, parseCountAccumulator, ServerGlobalParams::FeatureCompatibility::Version::kVersion50);
 
 const char* AccumulatorSum::getOpName() const {
     return "$sum";
-- 
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