# What are the limitations of array size at document in elastic search?

**URL:** <https://discuss.elastic.co/t/what-are-the-limitations-of-array-size-at-document-in-elastic-search/300602>\
**Category:** Elasticsearch\
**Created:** [March 24, 2022, 4:02pm UTC](https://discuss.elastic.co/t/what-are-the-limitations-of-array-size-at-document-in-elastic-search/300602 "2022-03-24T16:02:17Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![AhmadHamouda](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ahmadhamouda/32/99880_2.png) [@AhmadHamouda](https://discuss.elastic.co/u/AhmadHamouda)\
**Post date:** [March 24, 2022, 4:02pm UTC](https://discuss.elastic.co/t/what-are-the-limitations-of-array-size-at-document-in-elastic-search/300602/1 "2022-03-24T16:02:17Z")

</div>

I have document which have array.

```auto
{
   "id" :1,
   "UserIds":[1,2,4]
}

```

Given that UserIds is indexed field  
What are the performance implications of having several elements on UserIds Array on search?  
Also why when sending single request it take 50ms, however if I sent 100 parallel request it take up to 500ms?

---

<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:** [April 21, 2022, 4:02pm UTC](https://discuss.elastic.co/t/what-are-the-limitations-of-array-size-at-document-in-elastic-search/300602/2 "2022-04-21T16:02:55Z")

</div>

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