Index timestamps not working properly?

want to close my indices by using curator Curator allows you to delete or close
indices by time, so if you say "close --older-than 30" it will close all
indices older than 30 days. I use curator on 3 machines and it is working
fine on 2 of them.

When I call curator on the 3rd machine, nothing will happen, no indices
will be deleted
(the indices have been added to elasticsearch 90 days ago
by using logstash. There is no exception, this is the output of curator:

2014-12-10 14:27:18,657 INFO Job starting...
2014-12-10 14:27:18,663 INFO Closing indices...
2014-12-10 14:27:18,670 INFO Closed specified indices.
2014-12-10 14:27:18,670 INFO Done in 0:00:00.021329.

I know that this can be caused by using the wrong date-format for the
indices timestamps or if the indices actually have no timestamps defined.
But I actually don't know how to check for this mistake.

How can I see if an index has a valid timestamp?



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