# How search in datastream by timestamp works?

**URL:** <https://discuss.elastic.co/t/how-search-in-datastream-by-timestamp-works/305694>\
**Category:** Elasticsearch\
**Tags:** datastreams\
**Created:** [May 26, 2022, 9:25am UTC](https://discuss.elastic.co/t/how-search-in-datastream-by-timestamp-works/305694 "2022-05-26T09:25:05Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Chanturia\_Dmitry](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/chanturia_dmitry/32/106194_2.png) [@Chanturia\_Dmitry](https://discuss.elastic.co/u/Chanturia_Dmitry)\
**Post date:** [May 26, 2022, 9:25am UTC](https://discuss.elastic.co/t/how-search-in-datastream-by-timestamp-works/305694/1 "2022-05-26T09:25:05Z")

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Hello.  
Can U explain how works search in datastream by timestamp field?  
For example:  
I have a datastream with two indexes. Each Index have 10 primary shards.  
What happens when I search by timestamp? Elastic will be search timespan in each document in shard?  
Help me to understand please.

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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:** [May 30, 2022, 4:21am UTC](https://discuss.elastic.co/t/how-search-in-datastream-by-timestamp-works/305694/2 "2022-05-30T04:21:45Z")

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Welcome to our community! 😃

Elasticsearch uses [Field capabilities API | Elasticsearch Guide [8.2] | Elastic](https://www.elastic.co/guide/en/elasticsearch/reference/8.2/search-field-caps.html) to figure out what indices and shards can be skipped, and which hold relevant data.

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**Author:** ![Chanturia\_Dmitry](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/chanturia_dmitry/32/106194_2.png) [@Chanturia\_Dmitry](https://discuss.elastic.co/u/Chanturia_Dmitry)\
**Post date:** [May 30, 2022, 7:26am UTC](https://discuss.elastic.co/t/how-search-in-datastream-by-timestamp-works/305694/3 "2022-05-30T07:26:24Z")

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> [@warkolm](#):
>
> Elasticsearch uses [Field capabilities API | Elasticsearch Guide [8.2] | Elastic ](https://www.elastic.co/guide/en/elasticsearch/reference/8.2/search-field-caps.html) to figure out what indices and shards can be skipped, and which hold relevant data.

Thank you so much!!!!

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<div class="post-metadata">

**Author:** ![Chanturia\_Dmitry](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/chanturia_dmitry/32/106194_2.png) [@Chanturia\_Dmitry](https://discuss.elastic.co/u/Chanturia_Dmitry)\
**Post date:** [May 30, 2022, 11:08am UTC](https://discuss.elastic.co/t/how-search-in-datastream-by-timestamp-works/305694/4 "2022-05-30T11:08:40Z")

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Elastic retrieves all indexes when call field capabilities? Or elastic store field info to some private table?  
I just try to understand how query to data stream works.  
Thx

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<div class="post-metadata">

**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:** [May 31, 2022, 2:10am UTC](https://discuss.elastic.co/t/how-search-in-datastream-by-timestamp-works/305694/5 "2022-05-31T02:10:35Z")

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I don't think there's any direct caching by Elasticsearch on that information.

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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:** [June 28, 2022, 2:11am UTC](https://discuss.elastic.co/t/how-search-in-datastream-by-timestamp-works/305694/6 "2022-06-28T02:11:15Z")

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