# Use analyzer on existing index field to extract keywords

**URL:** <https://discuss.elastic.co/t/use-analyzer-on-existing-index-field-to-extract-keywords/134725>\
**Category:** Logstash\
**Created:** [June 6, 2018, 6:05am UTC](https://discuss.elastic.co/t/use-analyzer-on-existing-index-field-to-extract-keywords/134725 "2018-06-06T06:05:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![hvarun](https://avatars.discourse-cdn.com/v4/letter/h/b77776/32.png) [@hvarun](https://discuss.elastic.co/u/hvarun)\
**Post date:** [June 6, 2018, 6:05am UTC](https://discuss.elastic.co/t/use-analyzer-on-existing-index-field-to-extract-keywords/134725/1 "2018-06-06T06:05:32Z")

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Hello,

I am looking to apply language analyzer to an existing index which i have created in elastic. can anyone suggest how i can mention the index column in the text field instead of static text currently i am trying with this URL

curl -XGET [http://localhost:9200/mailindex/\_analyze?analyzer=english](http://localhost:9200/mailindex/_analyze?analyzer=english) -d "{"field" : "columnname","text" : "This is a test"}"

and once it is extracted the tokens can we update back the same index or needs to be created in new one?

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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 4, 2018, 6:05am UTC](https://discuss.elastic.co/t/use-analyzer-on-existing-index-field-to-extract-keywords/134725/2 "2018-07-04T06:05:45Z")

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