Currently as part of commit the caller can provide a CommitInfo instance which captures some metadata related to commit being performed. Note that CommitInfo instance passed to NodeStore is immutable.
For some usecases we need a way to add some more metadata to on going
commit from within the CommitHook
OAK-4586- Here we need to record nodetypes of nodes which got modified as part of current commit OAK-4412- Here we want to generate Documents for modified nodestate (per index definition) and "attach" it to current commit
This meta information would later be used by Observer.
To enable such cases some mutable state needs to be exposed as part of CommitInfo which can be used by CommitHooks.
As per discussion of DL  this can be done by adding a new CommitAttributes instance which can be accessed from CommitInfo