# Roll Up for \_size field / Archive \_size field for statistics

**URL:** <https://discuss.elastic.co/t/roll-up-for-size-field-archive-size-field-for-statistics/296485>\
**Category:** Elasticsearch\
**Tags:** rollups\
**Created:** [February 7, 2022, 2:48pm UTC](https://discuss.elastic.co/t/roll-up-for-size-field-archive-size-field-for-statistics/296485 "2022-02-07T14:48:54Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Kosodrom](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kosodrom/32/99278_2.png) [@Kosodrom](https://discuss.elastic.co/u/Kosodrom)\
**Post date:** [February 7, 2022, 2:48pm UTC](https://discuss.elastic.co/t/roll-up-for-size-field-archive-size-field-for-statistics/296485/1 "2022-02-07T14:48:54Z")

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Hi folks,

I want to archive the `_size` field (along with some other fields such as `kubernetes.namespace`) in a dedicated archive index. From [here](https://discuss.elastic.co/t/save-a-field-into-another-index/292455) I have learned that this could be done using [Roll Ups](https://www.elastic.co/guide/en/elasticsearch/reference/current/rollup-overview.html).

However I am not sure how I can configure it. I can see in the roll up UI in kibana, that some documents have been "considered" but I see 0 documents in my archive index.

This is my roll up job config:

```auto
{
  "config": {
    "id": "archive",
    "index_pattern": "my-index-*",
    "rollup_index": "archive",
    "cron": "0 * * * * ?",
    "groups": {
      "date_histogram": {
        "fixed_interval": "5m",
        "field": "@timestamp",
        "delay": "1m",
        "time_zone": "UTC"
      },
      "histogram": {
        "interval": 5,
        "fields": [
          "_size"
        ]
      },
      "terms": {
        "fields": [
          "kubernetes.namespace"
        ]
      }
    },
    "metrics": [
      {
        "field": "@timestamp",
        "metrics": [
          "max",
          "min",
          "value_count"
        ]
      },
      {
        "field": "_size",
        "metrics": [
          "avg",
          "max",
          "min",
          "sum",
          "value_count"
        ]
      }
    ],
    "timeout": "20s",
    "page_size": 1000
  },
  "status": {
    "job_state": "started",
    "current_position": {
      "@timestamp.date_histogram": 1643907600000,
      "_size.histogram": null,
      "kubernetes.namespace.terms": null
    },
    "upgraded_doc_id": true
  },
  "stats": {
    "pages_processed": 92,
    "documents_processed": 2178506,
    "rollups_indexed": 89866,
    "trigger_count": 2,
    "index_time_in_ms": 11240,
    "index_total": 90,
    "index_failures": 0,
    "search_time_in_ms": 12665,
    "search_total": 92,
    "search_failures": 0,
    "processing_time_in_ms": 1195,
    "processing_total": 92
  }
}

```

Appreciate any help. Thanks

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 7, 2022, 2:49pm UTC](https://discuss.elastic.co/t/roll-up-for-size-field-archive-size-field-for-statistics/296485/2 "2022-03-07T14:49:08Z")

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