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-rw-r--r--src/mongo/db/repl/oplog_entry.idl1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mongo/db/repl/oplog_entry.idl b/src/mongo/db/repl/oplog_entry.idl
index ff3fd6d07f6..8ee6d00ee56 100644
--- a/src/mongo/db/repl/oplog_entry.idl
+++ b/src/mongo/db/repl/oplog_entry.idl
@@ -100,6 +100,7 @@ structs:
h:
cpp_name: hash
type: long
+ optional: true # Only used for backwards compatibility with 4.0 and before.
description: "The hash of the oplog entry"
v:
cpp_name: version