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-rw-r--r--src/mongo/db/pipeline/document_source_merge.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/mongo/db/pipeline/document_source_merge.cpp b/src/mongo/db/pipeline/document_source_merge.cpp
index 63e2aa38bde..ed9c14b3bed 100644
--- a/src/mongo/db/pipeline/document_source_merge.cpp
+++ b/src/mongo/db/pipeline/document_source_merge.cpp
@@ -555,7 +555,9 @@ Value DocumentSourceMerge::serialize(boost::optional<ExplainOptions::Verbosity>
return mergeOnFields;
}());
spec.setTargetCollectionVersion(
- _targetCollectionVersion ? boost::make_optional(ShardVersion(*_targetCollectionVersion))
+ _targetCollectionVersion ? boost::make_optional(ShardVersion(
+ *_targetCollectionVersion,
+ CollectionIndexes(*_targetCollectionVersion, boost::none)))
: boost::none);
return Value(Document{{getSourceName(), spec.toBSON()}});
}