# Mapping a json document where an arbitrary key is having a nested object value

**URL:** <https://discuss.elastic.co/t/mapping-a-json-document-where-an-arbitrary-key-is-having-a-nested-object-value/56570>\
**Category:** Elasticsearch\
**Created:** [July 27, 2016, 11:35pm UTC](https://discuss.elastic.co/t/mapping-a-json-document-where-an-arbitrary-key-is-having-a-nested-object-value/56570 "2016-07-27T23:35:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![KaiHackemesser](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kaihackemesser/32/11094_2.png) [@KaiHackemesser](https://discuss.elastic.co/u/KaiHackemesser)\
**Post date:** [July 27, 2016, 11:35pm UTC](https://discuss.elastic.co/t/mapping-a-json-document-where-an-arbitrary-key-is-having-a-nested-object-value/56570/1 "2016-07-27T23:35:57Z")

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Hello,

given I want to index documents that look like  
`{ "id": {["key":"value"]}}`  
where `id` is an arbitrary value - how do I define the mapping? The keys within the nested object are definable, but the id is unpredictable.

Cheers,  
Kai

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**Author:** ![javanna](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/javanna/32/4698_2.png) [@javanna](https://discuss.elastic.co/u/javanna)\
**Post date:** [July 28, 2016, 11:24am UTC](https://discuss.elastic.co/t/mapping-a-json-document-where-an-arbitrary-key-is-having-a-nested-object-value/56570/2 "2016-07-28T11:24:44Z")

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Could you specify a bit more about your usecase? What are you using this data for? How do you plan to query that data?

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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:** [July 5, 2017, 10:32pm UTC](https://discuss.elastic.co/t/mapping-a-json-document-where-an-arbitrary-key-is-having-a-nested-object-value/56570/3 "2017-07-05T22:32:07Z")

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