Lifecycle policies don't work

Elastic Stack Elasticsearch
3 
PUT _index_template/v2-testdiag
{
  "version": 1,
  "template": {
    "settings": {
      "index": {
        "lifecycle": {
          "name": "test-diag",
          "rollover_alias": "v2-testdiag"
        },
        "number_of_shards": "1",
        "number_of_replicas": "0"
      }
    },
    "mappings": {
      "_source": {
        "excludes": [],
        "includes": [],
        "enabled": true
      },
      "_routing": {
        "required": false
      },
      "dynamic": false,
      "properties": {
        "@timestamp": {
          "type": "date"
        },
        "name": {
          "type": "keyword"
        },
        "message": {
          "type": "text"
        },
        "type": {
          "type": "keyword"
        }
      }
    },
    "aliases": {
      "v2-testdiag": {}
    }
  },
  "index_patterns": [
    "v2-testdiag-*"
  ]
}

{
  "test-diag" : {
    "version" : 7,
    "modified_date" : "2021-06-17T04:24:05.152Z",
    "policy" : {
      "phases" : {
        "hot" : {
          "min_age" : "0ms",
          "actions" : {
            "rollover" : {
              "max_size" : "20gb",
              "max_age" : "1m"
            },
            "set_priority" : {
              "priority" : 100
            }
          }
        },
        "delete" : {
          "min_age" : "5m",
          "actions" : {
            "delete" : {
              "delete_searchable_snapshot" : true
            }
          }
        }
      }
    }
  }
}

    elasticsearch {
      hosts => ["localhost"]
      index => "v2-testdiag-000001"
      ilm_rollover_alias => "v2-testdiag"
      ilm_pattern => "000001"
      ilm_policy => "test-diag"
    }