Add an option on bulk command to refresh index before completing

When invoking a bulk command the processing can be reported as completed while other triggered tasks are still pending,
for instance, the indexing might have been submitted but until the elastic index is refreshed the updated documents are not searchable.

When a bulk action is invoked from the UI waiting for the completed status is then not enough, we also want to wait for the indexed document to be searchable,
so refreshing a page after a bulk command has completed displays the expected content.