Why the rolled over new index is having zero documents?

Open Source Elasticsearch and Kibana
1

Hi,

I am using metricbeat to publish metrics to elasticsearch and below is my configuration;

setup.template.settings.index.opendistro.index_state_management.policy_id: "metricbeat"
setup.template.name: "metricbeat-7.9.1"
setup.template.pattern: "metricbeat-7.9.1"
output.elasticsearch.index: "metricbeat-7.9.1-000001"
setup.ilm.enabled: false

I created an ISM policy named metricbeat like below;

{
  "policy": {
    "policy_id": "metricbeat",
    "states": [
      {
        "name": "hot",
        "actions": [
          {
            "rollover": {
              "min_size": "5mb"
            }
          }
        ],
        "transitions": [
          {
            "state_name": "delete",
            "conditions": {
              "min_index_age": "50m"
            }
          }
        ]
      },
      {
        "name": "delete",
        "actions": [
          {
            "delete": {}
          }
        ],
        "transitions": []
      }
    ]
  }
}

I have the template metricbeat-7.9.1 like below;

{
  "metricbeat-7.9.1" : {
    "order" : 1,
    "index_patterns" : [
      "metricbeat-7.9.1-*"
    ],
    "settings" : {
      "index" : {
        "opendistro" : {
          "index_state_management" : {
            "policy_id" : "metricbeat",
            "rollover_alias" : "metricbeat-7.9.1"
          }
        }
      }
    },
    "aliases" : {
      "metricbeat" : { }
    }
  }
}

and I attached the alias as well, like below;

POST /_aliases
{
  "actions" : [
    {
      "add" : {
        "index" : "metricbeat-7.9.1-*",
        "alias" : "metricbeat-7.9.1",
        "is_write_index" : true
      } 
    }
  ]
}

What happened was, the rollover index metricbeat-7.9.1-000002 got created successfully, but the size is 0. Why is this happening?

Thanks.