1 files changed, 5 insertions, 9 deletions
diff --git a/src/mongo/db/s/collection_metadata.cpp b/src/mongo/db/s/collection_metadata.cpp
index 6b0fb689356..ea9f6f0c7c1 100644
--- a/src/mongo/db/s/collection_metadata.cpp
+++ b/src/mongo/db/s/collection_metadata.cpp
@@ -107,13 +107,13 @@ void CollectionMetadata::throwIfReshardingInProgress(NamespaceString const& nss)
     }
 }
 
-BSONObj CollectionMetadata::extractDocumentKey(const ShardKeyPattern* shardKeyPattern,
-                                               const BSONObj& doc) {
+BSONObj CollectionMetadata::extractDocumentKey(const BSONObj& doc) const {
     BSONObj key;
 
-    if (shardKeyPattern) {
-        key = dotted_path_support::extractElementsBasedOnTemplate(doc, shardKeyPattern->toBSON());
-        if (shardKeyPattern->hasId()) {
+    if (isSharded()) {
+        auto const& pattern = _cm->getShardKeyPattern();
+        key = dotted_path_support::extractElementsBasedOnTemplate(doc, pattern.toBSON());
+        if (pattern.hasId()) {
             return key;
         }
         // else, try to append an _id field from the document.
@@ -127,10 +127,6 @@ BSONObj CollectionMetadata::extractDocumentKey(const ShardKeyPattern* shardKeyPa
     return doc;
 }
 
-BSONObj CollectionMetadata::extractDocumentKey(const BSONObj& doc) const {
-    return extractDocumentKey(isSharded() ? &_cm->getShardKeyPattern() : nullptr, doc);
-}
-
 std::string CollectionMetadata::toStringBasic() const {
     if (isSharded()) {
         return str::stream() << "collection version: " << _cm->getVersion().toString()