Update elasticsearch custodial crons.

* modules/openstack_project/manifests/elasticsearch.pp: Delete the index
that is rolling over a few hours earlier to reduce period of extra disk
use. Remove the index optimization cron as optimizing the indexes is
expensive, requires a lot of disk headroom, and may not end up being
beneficial.

Change-Id: Id17df1389be392242ee4f3e89ae140cb03bcb0db
Merge "Update elasticsearch custodial crons."