1 files changed, 1 insertions, 5 deletions
diff --git a/src/mongo/db/pipeline/document_source_index_stats.h b/src/mongo/db/pipeline/document_source_index_stats.h
index c0f15bde79b..1c7f7525317 100644
--- a/src/mongo/db/pipeline/document_source_index_stats.h
+++ b/src/mongo/db/pipeline/document_source_index_stats.h
@@ -75,11 +75,7 @@ public:
 
     // virtuals from DocumentSource
     const char* getSourceName() const final;
-    Value serialize(boost::optional<ExplainOptions::Verbosity> explain = boost::none) const final;
-
-    Value serialize(SerializationOptions opts) const final override {
-        MONGO_UNIMPLEMENTED;
-    }
+    Value serialize(SerializationOptions opts = SerializationOptions()) const final override;
 
     StageConstraints constraints(Pipeline::SplitState pipeState) const final {
         StageConstraints constraints(StreamType::kStreaming,