SERVER-89328 Avoid having the same variable name in DocumentKey constructor (#21879) (#31923)

GitOrigin-RevId: 5c4455f66619b3700611ee8069055cfbf2806bde

Author: ben-gawel

src/mongo/db/op_observer/op_observer_util.h

@@ -40,8 +40,8 @@ BSONObj makeCollModCmdObj(const BSONObj& collModCmd,
 
 class DocumentKey {
 public:
-    DocumentKey(BSONObj id, boost::optional<BSONObj> _shardKey)
-        : _id(id.getOwned()), _shardKey(std::move(_shardKey)) {
+    DocumentKey(BSONObj id, boost::optional<BSONObj> shardKey)
+        : _id(id.getOwned()), _shardKey(std::move(shardKey)) {
         invariant(!id.isEmpty());
 
         if (_shardKey) {