SERVER-92803 Ignore IndexKeysSpecsConflict error during oplog application to v7.0 (#29143)

GitOrigin-RevId: 5bcbbf02cb9f14b0c193d835ef1b87892fd74f15

Author: brad-cater-mongodb

src/mongo/db/repl/oplog.cpp

@@ -1032,8 +1032,13 @@ const StringMap<ApplyOpMetadata> kOpsMap = {
               opCtx, applicationMode, swOplogEntry.getValue());
           return Status::OK();
       },
+      // These index related error codes needs to be ignored during initial sync because these
+      // indexes can already be cloned during initial sync database cloning and the oplogs become
+      // no-op. During steady state, since DDL oplogs are applied in serial, we should never see
+      // these errors.
       {ErrorCodes::IndexAlreadyExists,
        ErrorCodes::IndexBuildAlreadyInProgress,
+       ErrorCodes::IndexKeySpecsConflict,
        ErrorCodes::NamespaceNotFound}}},
     {"commitIndexBuild",
      {[](OperationContext* opCtx, const ApplierOperation& op, OplogApplication::Mode mode)