PVS-Studio warning V501 for MongoDB

bool operator==(const MemberCfg& r) const {
  ....
  return _id==r._id && votes == r.votes &&
         h == r.h && priority == r.priority &&
         arbiterOnly == r.arbiterOnly &&
         slaveDelay == r.slaveDelay &&
         hidden == r.hidden &&
         buildIndexes == buildIndexes;        <<<---
}

This suspicious code was found in MongoDB project by PVS-Studio static code analyzer.
Warning message is:
V501 There are identical sub-expressions to the left and to the right of the '==' operator: buildIndexes == buildIndexes rs_config.h 101

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