Moving data streams to warm phase dowsampling

Elastic Stack Elasticsearch
1 
POST _ilm/move/.ds-heartbeat-8.13.2-2024.04.29-000001
{
  "current_step": { 
    "phase": "warm",
    "action": "complete",
    "name": "complete"
  },
  "next_step": { 
    "phase": "warm",
    "action": "downsample",
    "name": "downsample"
  }
}

when I post the above in the dev tools console I get the following error

{
  "error": {
    "root_cause": [
      {
        "type": "illegal_argument_exception",
        "reason": """step [{"phase":"warm","action":"downsample","name":"downsample"}] for index [.ds-heartbeat-8.13.2-2024.04.29-000001] with policy [heartbeat] does not exist"""
      }
    ],
    "type": "illegal_argument_exception",
    "reason": """step [{"phase":"warm","action":"downsample","name":"downsample"}] for index [.ds-heartbeat-8.13.2-2024.04.29-000001] with policy [heartbeat] does not exist"""
  },
  "status": 400
}

when I runt it with out the name: dowsample (see below)

POST _ilm/move/.ds-heartbeat-8.13.2-2024.04.29-000001
{
  "current_step": { 
    "phase": "warm",
    "action": "complete",
    "name": "complete"
  },
  "next_step": { 
    "phase": "warm",
    "action": "downsample"
  }
}

it give me

{
  "acknowledged": true
}

but it does not actually downsample.

I know the documentation says that the name is required but I am not sure what the name would be.
is there somthing I am missing?

this is what the index status shows

{
  "indices": {
    ".ds-heartbeat-8.13.2-2024.04.29-000001": {
      "index": ".ds-heartbeat-8.13.2-2024.04.29-000001",
      "managed": true,
      "policy": "heartbeat",
      "index_creation_date_millis": 1714434932756,
      "time_since_index_creation": "48.8d",
      "lifecycle_date_millis": 1717027191770,
      "age": "18.8d",
      "phase": "warm",
      "phase_time_millis": 1718651824709,
      "action": "complete",
      "action_time_millis": 1718651825509,
      "step": "complete",
      "step_time_millis": 1718651825509,
      "phase_execution": {
        "policy": "heartbeat",
        "phase_definition": {
          "min_age": "30d",
          "actions": {
            "downsample": {
              "fixed_interval": "5m",
              "wait_timeout": "1d"
            },
            "set_priority": {
              "priority": 50
            }
          }
        },
        "version": 6,
        "modified_date_in_millis": 1718388796908
      }
    }
  }
}

when I ran

POST _ilm/move/.ds-packetbeat-8.13.1-2024.05.03-000002
{
  "current_step": { 
    "phase": "hot",
    "action": "complete",
    "name": "complete"
  },
  "next_step": { 
    "phase": "warm"
  }
}

it just did the shrink action but not the dowsampling

2

any ideas