1 files changed, 10 insertions, 0 deletions
diff --git a/src/mongo/db/ops/modifier_current_date.cpp b/src/mongo/db/ops/modifier_current_date.cpp
index cd328f5fe94..4496e0cd2cd 100644
--- a/src/mongo/db/ops/modifier_current_date.cpp
+++ b/src/mongo/db/ops/modifier_current_date.cpp
@@ -161,6 +161,8 @@ Status ModifierCurrentDate::prepare(mutablebson::Element root,
     // be created during the apply.
     Status status = pathsupport::findLongestPrefix(
         _updatePath, root, &_preparedState->idxFound, &_preparedState->elemFound);
+    const auto elemFoundIsArray =
+        _preparedState->elemFound.ok() && _preparedState->elemFound.getType() == BSONType::Array;
 
     // FindLongestPrefix may say the path does not exist at all, which is fine here, or
     // that the path was not viable or otherwise wrong, in which case, the mod cannot
@@ -175,6 +177,14 @@ Status ModifierCurrentDate::prepare(mutablebson::Element root,
     // there is any conflict among mods.
     execInfo->fieldRef[0] = &_updatePath;
 
+    if (!_preparedState->elemFound.ok() ||
+        _preparedState->idxFound < (_updatePath.numParts() - 1)) {
+        if (elemFoundIsArray) {
+            // Report that an existing array will gain a new element as a result of this mod.
+            execInfo->indexOfArrayWithNewElement[0] = _preparedState->idxFound;
+        }
+    }
+
     return Status::OK();
 }