# How to alter ElasticSearch Field name

**URL:** <https://discuss.elastic.co/t/how-to-alter-elasticsearch-field-name/41458>\
**Category:** Elasticsearch\
**Created:** [February 11, 2016, 7:48am UTC](https://discuss.elastic.co/t/how-to-alter-elasticsearch-field-name/41458 "2016-02-11T07:48:59Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![binurajps](https://avatars.discourse-cdn.com/v4/letter/b/eb8c5e/32.png) [@binurajps](https://discuss.elastic.co/u/binurajps)\
**Post date:** [February 11, 2016, 7:48am UTC](https://discuss.elastic.co/t/how-to-alter-elasticsearch-field-name/41458/1 "2016-02-11T07:48:59Z")

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curl -XPUT '[http://myhostname:9200/data/my\_data/\_mapping](http://myhostname:9200/data/my_data/_mapping)' -d '  
{  
"my\_data" : {  
"properties" : {  
"empID" : {"type" : "integer"},  
"empName" : {"type" : "string"}  
}  
}  
}'  
so, i want to alter fieldname 'empName' to 'Emp\_Name'.whether it is possible,and also i had data existing for this mapping.

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<div class="post-metadata">

**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [February 11, 2016, 8:18am UTC](https://discuss.elastic.co/t/how-to-alter-elasticsearch-field-name/41458/2 "2016-02-11T08:18:44Z")

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You have to create a new index/mapping and reindex.

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<div class="post-metadata">

**Author:** ![binurajps](https://avatars.discourse-cdn.com/v4/letter/b/eb8c5e/32.png) [@binurajps](https://discuss.elastic.co/u/binurajps)\
**Post date:** [February 11, 2016, 9:40am UTC](https://discuss.elastic.co/t/how-to-alter-elasticsearch-field-name/41458/3 "2016-02-11T09:40:04Z")

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How copy existing data to new filed? Is that possible?

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<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:** [July 5, 2017, 11:17pm UTC](https://discuss.elastic.co/t/how-to-alter-elasticsearch-field-name/41458/4 "2017-07-05T23:17:15Z")

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