# Is it possible to control which field to index in Logstash?
**URL:** https://discuss.elastic.co/t/is-it-possible-to-control-which-field-to-index-in-logstash/234546
**Category:** Logstash
**Created:** [May 27, 2020, 1:27pm UTC](https://discuss.elastic.co/t/is-it-possible-to-control-which-field-to-index-in-logstash/234546 "2020-05-27T13:27:09Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@tomeri](https://discuss.elastic.co/u/tomeri)
#### Post date: [May 27, 2020, 1:27pm UTC](https://discuss.elastic.co/t/is-it-possible-to-control-which-field-to-index-in-logstash/234546/1 "2020-05-27T13:27:09Z")
Hi,
I'm trying to apply some naming validation to each field that passes through Logstash, to match some predefined naming convention using regex.
Assuming that I can distinguish within Logstash which field is eligible to be indexed or not, is it possible to somehow hint elasticsearch to not index them? without changing the field's name.
Thanks,
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### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [May 27, 2020, 2:16pm UTC](https://discuss.elastic.co/t/is-it-possible-to-control-which-field-to-index-in-logstash/234546/2 "2020-05-27T14:16:21Z")
Typically, if you send a field to elasticsearch then it will get indexed. If you do not want to index the field either remove it from the event, or disable [dynamic mapping](https://www.elastic.co/guide/en/elasticsearch/reference/current/dynamic-mapping.html), and create all your fields using a template in elasticsearch.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 24, 2020, 2:16pm UTC](https://discuss.elastic.co/t/is-it-possible-to-control-which-field-to-index-in-logstash/234546/3 "2020-06-24T14:16:21Z")
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