Major - P3 The master branch's role graph update logic has support for the following event on admin.system.roles:
BSON("createIndexes"
<< "system.roles"
<< "v"
<< 2
<< "name"
<< "role_1_db_1"
<< "key"
<< BSON("role" << 1 << "db" << 1)
<< "unique"
<< true)
{
We should ensure older stable branches can handle it as well. Without support, nodes may attempt to create a default index on the roles collection and trigger the following error message:
Unsupported modification to roles collection in oplog; restart this process to reenable user-defined roles; OplogOperationUnsupported: Unsupported oplog operation.