Time stamped indices use a dated index pattern instead of pointing directly
to one specific index. For example, to match the default logstash index pattern
you might use "logstash-"yyyy.mm.dd. The quotes around "logstash-"
are important as they instruct Kibana not to treat those letters as a pattern.
See http://blog.stevenlevithan.com/archives/date-time-format for documentation on date formatting.