FIX: Change Elasticsearch min_age setting for cold phase

[dougburks]

Currently, our default for warm min_age is 30d and cold min_age is the same 30d:
https://github.com/Security-Onion-Solutions/securityonion/blob/2.4/dev/salt/elasticsearch/defaults.yaml#L149-L172

We should change the cold min_age to something else like 60d perhaps.

We should make this change in the global_overrides section and in each of the individual index sections.

We should also change the ex. 30d in the description at:
https://github.com/Security-Onion-Solutions/securityonion/blob/2.4/dev/salt/elasticsearch/soc_elasticsearch.yaml#L123
and
https://github.com/Security-Onion-Solutions/securityonion/blob/2.4/dev/salt/elasticsearch/soc_elasticsearch.yaml#L305

[weslambert]

#12900