Performing reindex via BulkOnlyIndexManager

Hi everyone!
In our application we are trying to protect some procedures from running concurrently with full reindex.
We’ve faced with some issues and want to clarify one thing. As I can see IssueIndexManager component is responsible for performing full reindex and this component delegates reindex execution to DefaultIndexManager or BulkOnlyIndexManager depending on some runtime conditions. From our experience it is always delegated to DefaultIndexManager.
So the question is, are there real situations when full reindex is performed by BulkOnlyIndexManager?