Elastic Stack version: 6.2.3
Curator Version : 5.6.0
We have configured curator to delete the indices which are older than 14 days where indices are rolled on daily basis.
The configuration looks like:
    action: delete_indices
    description: "Delete \"security\" indices older than 14 days,(ignore_empty_list) and exit cleanly."
    filters: 
      - 
        exclude: ~
        filtertype: pattern
        kind: prefix
        value: security
      - 
        direction: older
        exclude: ~
        filtertype: age
        source: name
        timestring: "%Y.%m.%d"
        unit: days
        unit_count: 14
    options: 
      continue_if_exception: false
      disable_action: false
      ignore_empty_list: true
      timeout_override: ~
However, it has been noticed several times that curator is also deleting the newer indices.
For 24th June midnight run, the output was:
2019-06-25 00:04:46,739 INFO      Trying Action ID: 15, "delete_indices": Delete "security" indices older than 14 days,(ignore_empty_list) and exit cleanly.
--
  | 2019-06-25 00:04:58,935 INFO      Deleting selected indices: [u'security-logging.ec2.2019.06.10', u'security-logging.ec2.2019.06.11', u'security-logging.ec2.2019.06.09', u'security-logging.ec2.2019.06.08', u'security-logging.ec2.2018.06.22', u'security-logging.ec2.2018.06.23', u'security-logging.ec2.2018.06.21', u'security-logging.ec2.2018.06.24', u'security-logging.ec2.2018.06.25']
  | 2019-06-25 00:04:58,935 INFO      ---deleting index security-logging.ec2.2019.06.10
  | 2019-06-25 00:04:58,936 INFO      ---deleting index security-logging.ec2.2019.06.11
  | 2019-06-25 00:04:58,936 INFO      ---deleting index security-logging.ec2.2019.06.09
  | 2019-06-25 00:04:58,936 INFO      ---deleting index security-logging.ec2.2019.06.08
  | 2019-06-25 00:04:58,936 INFO      ---deleting index security-logging.ec2.2018.06.22
  | 2019-06-25 00:04:58,936 INFO      ---deleting index security-logging.ec2.2018.06.23
  | 2019-06-25 00:04:58,936 INFO      ---deleting index security-logging.ec2.2018.06.21
  | 2019-06-25 00:04:58,936 INFO      ---deleting index security-logging.ec2.2018.06.24
  | 2019-06-25 00:04:58,936 INFO      ---deleting index security-logging.ec2.2018.06.25
  | 2019-06-25 00:05:01,089 INFO      Action ID: 15, "delete_indices" completed.
  | 2019-06-25 00:05:01,089 INFO      Job completed.