From d94b9f177bb3e0463e9e8c4d75f4a51e417872ef Mon Sep 17 00:00:00 2001
From: Allison Easton <allison.easton@mongodb.com>
Date: Wed, 7 Dec 2022 12:42:49 +0000
Subject: SERVER-71756 Defragmentation policy should issue dataSize commands
 with estimate true

(cherry picked from commit 49c71b36991b5eb765f66e03d09af6673c9aead7)
---
 .../db/s/balancer/balancer_defragmentation_policy_impl.cpp     | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/mongo/db/s/balancer/balancer_defragmentation_policy_impl.cpp b/src/mongo/db/s/balancer/balancer_defragmentation_policy_impl.cpp
index 63b2b8e4d22..df80d254e12 100644
--- a/src/mongo/db/s/balancer/balancer_defragmentation_policy_impl.cpp
+++ b/src/mongo/db/s/balancer/balancer_defragmentation_policy_impl.cpp
@@ -217,8 +217,14 @@ public:
 
             if (pendingActions.rangesWithoutDataSize.size() > pendingActions.rangesToMerge.size()) {
                 const auto& rangeToMeasure = pendingActions.rangesWithoutDataSize.back();
-                nextAction = boost::optional<DefragmentationAction>(DataSizeInfo(
-                    shardId, _nss, _uuid, rangeToMeasure, shardVersion, _shardKey, false));
+                nextAction =
+                    boost::optional<DefragmentationAction>(DataSizeInfo(shardId,
+                                                                        _nss,
+                                                                        _uuid,
+                                                                        rangeToMeasure,
+                                                                        shardVersion,
+                                                                        _shardKey,
+                                                                        true /* estimate */));
                 pendingActions.rangesWithoutDataSize.pop_back();
             } else if (!pendingActions.rangesToMerge.empty()) {
                 const auto& rangeToMerge = pendingActions.rangesToMerge.back();
-- 
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