# How do I use the \_id field in Painless?

**URL:** <https://discuss.elastic.co/t/how-do-i-use-the--id-field-in-painless/66642>\
**Category:** Elasticsearch\
**Created:** [November 20, 2016, 12:14pm UTC](https://discuss.elastic.co/t/how-do-i-use-the--id-field-in-painless/66642 "2016-11-20T12:14:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Tal\_Weiss](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/tal_weiss/32/13021_2.png) [@Tal\_Weiss](https://discuss.elastic.co/u/Tal_Weiss)\
**Post date:** [November 20, 2016, 12:14pm UTC](https://discuss.elastic.co/t/how-do-i-use-the--id-field-in-painless/66642/1 "2016-11-20T12:14:27Z")

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How do I access the \_id field of a document in the Painless scripting language?

Every time I try something like this:

doc['\_id'] + "/" + doc['site\_code'].value  
doc['\_index'] + "/" + doc['site\_code'].value  
ctx.index + "/" + doc['sitecode'].value

All shards crash???

Not very friendly. I'm trying a scripted filed via Kibana with latest hosting plan.

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<div class="post-metadata">

**Author:** ![Tal\_Weiss](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/tal_weiss/32/13021_2.png) [@Tal\_Weiss](https://discuss.elastic.co/u/Tal_Weiss)\
**Post date:** [November 20, 2016, 2:39pm UTC](https://discuss.elastic.co/t/how-do-i-use-the--id-field-in-painless/66642/2 "2016-11-20T14:39:40Z")

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so I managed to access the \_id via the \_uid field, and applying .substring()

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 18, 2016, 2:40pm UTC](https://discuss.elastic.co/t/how-do-i-use-the--id-field-in-painless/66642/3 "2016-12-18T14:40:02Z")

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