Indexing with drush cron generates a lot of invalid cron notifications

When running cron via drush, everytime there are nodes to be indexed by Solr the following is outputted to stderr:
WD Apache Solr: On cron running apachesolr_nodeapi_mass_update() on nids [nids]

This is really annoying for sites with cron running every 5 minutes and lots of node creations/edits. Cron notification emails should only be triggered when something is wrong. The current behaviour of apache solr makes it really hard to find real problems with cron executions and most of the notifications are bogus.