/**

• Checks if an upsert of a remote document will override a local document with the same _id but in
• a different range on this shard. Must be in WriteContext to avoid races and DBHelper errors.
  *
• TODO: Could optimize this check out if sharding on _id.
  */
  The above is from [willOverrideLocalId||https://github.com/10gen/mongo/blob/b6ed62a551486e21d1f4efc9fd582514677b9625/src/mongo/db/s/migration_destination_manager.cpp#L237] function in migration_destination_manager.cpp

Creating a TODO ticket for same.