Set up ILM policyedit

In order for an index to use an ILM policy to manage its lifecycle we must first define a lifecycle policy for it to use. The following request creates a policy called my_policy in Elasticsearch which we can later use to manage our indexes.

PUT _ilm/policy/my_policy
{
  "policy": {
    "phases": {
      "hot": {
        "actions": {
          "rollover": {
            "max_size": "25GB" 
          }
        }
      },
      "delete": {
        "min_age": "30d",
        "actions": {
          "delete": {} 
        }
      }
    }
  }
}

Rollover the index when it reaches 25GB in size

Delete the index when its 30 days old

ILM will manage an index using the policy defined in the index.lifecycle.name index setting. If this setting does not exist in the settings for a particular index ILM will not manage that index.

To set the policy for an index there are two options: 1. Apply the policy to an index template and bootstrap creating the first index 2. Apply the policy to a new index in a create index request