No prefix necessary, actually, @warkolm. This should show all indices with a matching timestring and are older than 90 days.
@DigiAngel, please run with the --debug flag immediately after curator and before delete. You should get output which shows all indices found in one of the log lines.
curator delete indices --older-than 9 --time-unit days --timestring '%Y.%m.%d'
2016-02-26 13:26:43,791 INFO Job starting: delete indices
2016-02-26 13:26:43,803 INFO Pruning Kibana-related indices to prevent accidental deletion.
2016-02-26 13:26:43,803 INFO Action delete will be performed on the following indices: [u'logstash-2016.02.17']
2016-02-26 13:26:43,805 INFO Deleting indices as a batch operation:
2016-02-26 13:26:43,805 INFO ---deleting index logstash-2016.02.17
2016-02-26 13:26:44,223 INFO Job completed successfully.
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