# Data streams and Analyzers
**URL:** https://discuss.elastic.co/t/data-streams-and-analyzers/347697
**Category:** Elasticsearch
**Created:** [November 22, 2023, 7:55am UTC](https://discuss.elastic.co/t/data-streams-and-analyzers/347697 "2023-11-22T07:55:05Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Mertozturkk](https://discuss.elastic.co/u/Mertozturkk)
#### Post date: [November 22, 2023, 7:55am UTC](https://discuss.elastic.co/t/data-streams-and-analyzers/347697/1 "2023-11-22T07:55:05Z")
When we create an index, we can add a custom analyzer to text fields. Can we do the same in a datastream?
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [November 22, 2023, 8:04am UTC](https://discuss.elastic.co/t/data-streams-and-analyzers/347697/2 "2023-11-22T08:04:35Z")
As you do not control the creation of data stream indices you need to enforce mappings through an index template.
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### Author:  [@Mertozturkk](https://discuss.elastic.co/u/Mertozturkk)
#### Post date: [November 22, 2023, 8:06am UTC](https://discuss.elastic.co/t/data-streams-and-analyzers/347697/3 "2023-11-22T08:06:12Z")
Thank you, I will try this way
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 20, 2023, 8:07am UTC](https://discuss.elastic.co/t/data-streams-and-analyzers/347697/4 "2023-12-20T08:07:07Z")
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