# Big mapping and few fields on index

**URL:** <https://discuss.elastic.co/t/big-mapping-and-few-fields-on-index/270999>\
**Category:** Elasticsearch\
**Created:** [April 22, 2021, 5:42pm UTC](https://discuss.elastic.co/t/big-mapping-and-few-fields-on-index/270999 "2021-04-22T17:42:55Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![pereyrdi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/pereyrdi/32/12480_2.png) [@pereyrdi](https://discuss.elastic.co/u/pereyrdi)\
**Post date:** [April 22, 2021, 5:42pm UTC](https://discuss.elastic.co/t/big-mapping-and-few-fields-on-index/270999/1 "2021-04-22T17:42:55Z")

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Hello folks!  
A question about index template, because Im creating a template for many indexs and not in alls indexs, all fields available in template are used. In some case less than ten, and in template are available almost 1000.

Have a big index mapping with few fields really used in index could be a performance issue ?

Thanks  
Diego Perey

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [April 27, 2021, 2:00am UTC](https://discuss.elastic.co/t/big-mapping-and-few-fields-on-index/270999/2 "2021-04-27T02:00:57Z")

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If you have the fields defined in the template but they are not used in the indexed document, then no it's not a major concern.

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<div class="post-metadata">

**Author:** ![pereyrdi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/pereyrdi/32/12480_2.png) [@pereyrdi](https://discuss.elastic.co/u/pereyrdi)\
**Post date:** [April 27, 2021, 12:03pm UTC](https://discuss.elastic.co/t/big-mapping-and-few-fields-on-index/270999/3 "2021-04-27T12:03:06Z")

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Thanks!

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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:** [May 25, 2021, 12:03pm UTC](https://discuss.elastic.co/t/big-mapping-and-few-fields-on-index/270999/4 "2021-05-25T12:03:29Z")

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