# Rollup Fail: Existing mapping for field must be of type object

**URL:** https://discuss.elastic.co/t/rollup-fail-existing-mapping-for-field-must-be-of-type-object/256122
**Category:** Elasticsearch
**Created:** [November 20, 2020, 1:13pm UTC](https://discuss.elastic.co/t/rollup-fail-existing-mapping-for-field-must-be-of-type-object/256122 "2020-11-20T13:13:00Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![cawoodm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cawoodm/32/14083_2.png) [@cawoodm](https://discuss.elastic.co/u/cawoodm)
#### Post date: [November 20, 2020, 1:13pm UTC](https://discuss.elastic.co/t/rollup-fail-existing-mapping-for-field-must-be-of-type-object/256122/1 "2020-11-20T13:13:00Z")

</div>

Our rollup job will not run and we are getting the following error log:

```
[991]: index [issues-prod1], type [_doc], id [issues-prod1$ONEl7qIplbk6ayAuSYbUkA], message [MapperParsingException[Could not dynamically add mapping for field [category.terms._count]. Existing mapping for [category] must be of type object but found [keyword].]]
ex [issues-prod1], type [_doc], id [issues-prod1$g4xayKx3fDB9tjy5sjL_4A], message [MapperParsingException[Could not dynamically add mapping for field [category.terms._count]. Existing mapping for [category] must be of type object but found [keyword].]]
[985]: index [issues-prod1], type [_doc], id [issues-prod1$PxsTMNX_88zzL5JND6YMEg], message [MapperParsingException[Could not dynamically add mapping for field [category.terms._count]. Existing mapping for [category] must be of type object but found [keyword].]]

```

The rollup has 4 terms (keyword fields):

- type
- source
- category
- subcategory

The index mapping:

```auto
{
    "issues-prod1": {
        "mappings": {
            "properties": {
                "category": {
                    "type": "keyword",
                    "ignore_above": 50
                },
                "errors": {
                    "type": "long"
                },
                "source": {
                    "type": "keyword",
                    "ignore_above": 20
                },
                "subcategory": {
                    "type": "keyword"
                },
                "timestamp": {
                    "type": "date",
                    "format": "date_time||epoch_millis"
                }
            }
        }
    }
}

```

The rollup definition:

```auto
{
    "index_pattern": "logs-errors-prod*",
    "rollup_index": "issues-prod1",
    "cron": "0 55 * * * ?",
    "groups": {
        "date_histogram": {
            "interval": "1d",
            "field": "timestamp",
            "delay": "1m",
            "time_zone": "Europe/Zurich"
        },
        "terms": {
            "fields": [
                "type",
                "source",
                "category",
                "subcategory"
            ]
        }
    },
    "metrics": [],
    "timeout": "20s",
    "page_size": 1000
}

```

We do not have any documents in our index `logs-errors-prod` which have `category.keyword`

---

<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: [December 18, 2020, 1:13pm UTC](https://discuss.elastic.co/t/rollup-fail-existing-mapping-for-field-must-be-of-type-object/256122/2 "2020-12-18T13:13:20Z")

</div>

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