Hello,
As described in the docs, iterations inside the parallel element:
iterations(optional, defaults to 1): Allows to define a default value for all tasks of theparallelelement.
So this just propagates the iterations property to operations that support it. See the docs and this reply.
If you want to rerun bulk operations you can use a jinja2 for loop together with a comma joiner; here is an example from another track.
Rgs,
Dimitris