# Should Elastic Search be reindexed if I make any configuration changes to Logstash

**URL:** <https://discuss.elastic.co/t/should-elastic-search-be-reindexed-if-i-make-any-configuration-changes-to-logstash/231132>\
**Category:** Logstash\
**Created:** [May 5, 2020, 10:39am UTC](https://discuss.elastic.co/t/should-elastic-search-be-reindexed-if-i-make-any-configuration-changes-to-logstash/231132 "2020-05-05T10:39:13Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![harish411](https://avatars.discourse-cdn.com/v4/letter/h/74df32/32.png) [@harish411](https://discuss.elastic.co/u/harish411)\
**Post date:** [May 5, 2020, 10:39am UTC](https://discuss.elastic.co/t/should-elastic-search-be-reindexed-if-i-make-any-configuration-changes-to-logstash/231132/1 "2020-05-05T10:39:14Z")

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Hi  
If I make any configuration changes to Logstash.  
Will I see the chnages applied to Elastic Search  
For Example  
If I change the grok pattern and added new Fields,  
Will I be able to see the chnages effected on already indexed logs.

If not what should I do?  
Should I re-index whole old logs which are already indexed again to see the new fields??

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**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [May 5, 2020, 3:20pm UTC](https://discuss.elastic.co/t/should-elastic-search-be-reindexed-if-i-make-any-configuration-changes-to-logstash/231132/2 "2020-05-05T15:20:22Z")

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> [@harish411](#):
>
> Should I re-index whole old logs which are already indexed again to see the new fields??

Yes, is you change the logstash filters to add new fields you will need to re-index data to see the new fields on old documents.

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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 2, 2020, 3:20pm UTC](https://discuss.elastic.co/t/should-elastic-search-be-reindexed-if-i-make-any-configuration-changes-to-logstash/231132/3 "2020-06-02T15:20:32Z")

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