Set "index.mapping.dimension_fields.limit" does not work

Elastic Stack Elasticsearch
1

Hi everyone,

We would like to extend the number of dimension_fields of our TSDS by

POST _index_template/ds-micrometer-metrics-prod
{
  "index_patterns": [
    "micrometer"
  ],
  "data_stream": {},
  "template": {
    "settings": {
      "index.mode": "time_series",
      "index.mapping.dimension_fields.limit": 25,
      "index.routing_path": [
        "identifier"
      ]
    }
  },
  "composed_of": [
    "metrics-timeseries-datastream-mappings",
    "metrics-timeseries-datastream-prod-settings"
  ],
  "priority": 500
}

And we can get the template by

GET _index_template/ds-micrometer-metrics-prod

And result

{
  "index_templates": [
    {
      "name": "ds-micrometer-metrics-prod",
      ...
        "template": {
          "settings": {
            "index": {
              ....
              "mapping": {
                "dimension_fields": {
                  "limit": "25"
                }
              }
            }
          }
        },
...

However, when we tried to apply new mappings which has 23 dimension fields, we got error:

{
  "error": {
    "root_cause": [
      {
        "type": "illegal_argument_exception",
        "reason": "Limit of total dimension fields [21] has been exceeded"
      }
    ],
    "type": "illegal_argument_exception",
    "reason": "Limit of total dimension fields [21] has been exceeded"
  },
  "status": 400
}

Do you know why and how to fix this issue?

Elasticsearch: 8.8.1

Best regards,

2

For anyone has same issue.
You have to set the limit at the mapping not at the _index_template

POST _component_template/metrics-timeseries-datastream-mappings
{
    "template":
    {
        "settings":
        {
            "index":
            {
                "mode": "time_series",
                "routing_path":
                [
                    ...
                ],
                "mapping":
                {
                    "dimension_fields":
                    {
                        "limit": "25"
                    }
                }
            }
        },
3

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