# Field Collapsing
**URL:** https://discuss.elastic.co/t/field-collapsing/107119
**Category:** Elasticsearch
**Created:** [November 10, 2017, 12:06am UTC](https://discuss.elastic.co/t/field-collapsing/107119 "2017-11-10T00:06:33Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Atul\_Harsha](https://discuss.elastic.co/u/Atul_Harsha)
#### Post date: [November 10, 2017, 12:06am UTC](https://discuss.elastic.co/t/field-collapsing/107119/1 "2017-11-10T00:06:33Z")
Mapping:
```
PUT /my_index/_mapping/blogpost
{
"properties": {
"user": {
"properties": {
"name": {
"type": "string",
"fields": {
"raw": {
"type": "string",
"index": "not_analyzed"
}
}
}
}
}
}
}
```
Error:
```
{
"error": {
"root_cause": [
{
"type": "illegal_argument_exception",
"reason": "mapper [user] of different type, current_type [long], merged_type [ObjectMapper]"
}
],
"type": "illegal_argument_exception",
"reason": "mapper [user] of different type, current_type [long], merged_type [ObjectMapper]"
},
"status": 400
}
```
Data to be ingested:
```
PUT /my_index/blogpost/2
{
"title": "Relationships",
"body": "It's complicated...",
"user": {
"id": 1,
"name": "John Smith"
}
}
```
How should I resolve this mapping Issue?
---
### Author:  [@spinscale](https://discuss.elastic.co/u/spinscale)
#### Post date: [November 10, 2017, 9:24am UTC](https://discuss.elastic.co/t/field-collapsing/107119/2 "2017-11-10T09:24:53Z")
It seems you have indexed the `user` field as a long somewhere. you need to reindex your data to fix it. Take a look at the [reindex API](https://www.elastic.co/guide/en/elasticsearch/reference/5.6/docs-reindex.html) how to index your data into another index, where you can fix the mapping beforehand.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 8, 2017, 9:25am UTC](https://discuss.elastic.co/t/field-collapsing/107119/3 "2017-12-08T09:25:26Z")
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