# Is it possible to create a long scripted field from a string field?

**URL:** <https://discuss.elastic.co/t/is-it-possible-to-create-a-long-scripted-field-from-a-string-field/137960>\
**Category:** Kibana\
**Created:** [June 29, 2018, 12:25pm UTC](https://discuss.elastic.co/t/is-it-possible-to-create-a-long-scripted-field-from-a-string-field/137960 "2018-06-29T12:25:30Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![elasticheart](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/elasticheart/32/65189_2.png) [@elasticheart](https://discuss.elastic.co/u/elasticheart)\
**Post date:** [June 29, 2018, 12:25pm UTC](https://discuss.elastic.co/t/is-it-possible-to-create-a-long-scripted-field-from-a-string-field/137960/1 "2018-06-29T12:25:30Z")

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Hi,

I am using ELK GA 6.3.0. In my index, I have a field called `duration`. It is mapped as `String` type. I would like to do some mathematical operations and would like to create a field `duration_b` having datatype `long`. Is this possible? How can I do this?

Thanks.

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<div class="post-metadata">

**Author:** ![elasticheart](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/elasticheart/32/65189_2.png) [@elasticheart](https://discuss.elastic.co/u/elasticheart)\
**Post date:** [June 29, 2018, 12:51pm UTC](https://discuss.elastic.co/t/is-it-possible-to-create-a-long-scripted-field-from-a-string-field/137960/2 "2018-06-29T12:51:23Z")

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Solved it using;

```
return Long.parseLong(doc['duration.keyword'].value);

```

Is this correct procedure?

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**Author:** ![lukas](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/lukas/32/6812_2.png) [@lukas](https://discuss.elastic.co/u/lukas)\
**Post date:** [July 2, 2018, 7:40pm UTC](https://discuss.elastic.co/t/is-it-possible-to-create-a-long-scripted-field-from-a-string-field/137960/3 "2018-07-02T19:40:05Z")

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Yeah, that's exactly how you would want to do it 🙂

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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 30, 2018, 7:40pm UTC](https://discuss.elastic.co/t/is-it-possible-to-create-a-long-scripted-field-from-a-string-field/137960/4 "2018-07-30T19:40:12Z")

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