In d_migrate.cpp, we're accidentally passing the fromMigrate flag as the god mode flag when initially creating to-side indexes.

theDataFileMgr.insertAndLog( system_indexes.c_str() , idx, true /* flag fromMigrate in oplog */ );

There are two boolean params to insertAndLog, fromMigrate is the second.

No impact aside from index creation not being tagged as fromMigrate.