# How to change index mapping?
**URL:** https://discuss.elastic.co/t/how-to-change-index-mapping/230997
**Category:** Kibana
**Created:** [May 4, 2020, 3:44pm UTC](https://discuss.elastic.co/t/how-to-change-index-mapping/230997 "2020-05-04T15:44:41Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@DeepakBishi](https://discuss.elastic.co/u/DeepakBishi)
#### Post date: [May 4, 2020, 3:44pm UTC](https://discuss.elastic.co/t/how-to-change-index-mapping/230997/1 "2020-05-04T15:44:41Z")
Hi,
I am using ELK of version 6.4.3
I want to changes a field mapping. Can someone help me with the api in dev tools to change.
My goal is to change the ignore\_above value of message field. Below is the mapping of one of the indices.
{
"slowquerry-2020.04.29": {
"mappings": {
"slowquerry": {
"properties": {
"@timestamp": {
"type": "date"
},
"@version": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Env\_name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Host": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Insert\_Id": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Last\_Insert\_Id": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Lock\_Time": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Log\_Date": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Log\_Time": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Query\_Time": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Rows\_Examined": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Rows\_Sent": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Schema": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Server\_Id": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"Sql\_Command": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"ThreadId": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"User": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"appid": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"beat": {
"properties": {
"hostname": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"version": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
}
}
},
"class": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"fields": {
"properties": {
"application": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"document\_type": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"type": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
}
}
},
"host": {
"properties": {
"name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
}
}
},
"input": {
"properties": {
"type": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
}
}
},
"message": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"offset": {
"type": "long"
},
"prospector": {
"properties": {
"type": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
}
}
},
"random": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"random2": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"solution\_name": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"source": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
},
"tags": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore\_above": 256
}
}
}
}
}
}
}
}
---
### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [May 4, 2020, 9:55pm UTC](https://discuss.elastic.co/t/how-to-change-index-mapping/230997/2 "2020-05-04T21:55:49Z")
You cannot change a mapping once it has been applied, you will need/want to setup an index template that can be applied to any matching indices (eg `slowquery-*`) with the changes you want. Then you will need to either reindex the old data, or wait till a new (daily by the looks of it) index is created with the new mapping.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 1, 2020, 9:55pm UTC](https://discuss.elastic.co/t/how-to-change-index-mapping/230997/3 "2020-06-01T21:55:54Z")
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