# Reindexing a big index without down time

**URL:** https://discuss.elastic.co/t/reindexing-a-big-index-without-down-time/345050
**Category:** Elasticsearch
**Created:** [October 15, 2023, 12:59pm UTC](https://discuss.elastic.co/t/reindexing-a-big-index-without-down-time/345050 "2023-10-15T12:59:19Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![PodarcisMuralis](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/podarcismuralis/32/122606_2.png) [@PodarcisMuralis](https://discuss.elastic.co/u/PodarcisMuralis)
#### Post date: [October 15, 2023, 12:59pm UTC](https://discuss.elastic.co/t/reindexing-a-big-index-without-down-time/345050/1 "2023-10-15T12:59:19Z")

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Hi.

I have a really big index with 100 millions of documents.  
I want to add some new fields, change existing ones and delete the redundant ones by applying explicit index. I will also use alias to switch the indiced.

--\> existing\_index - ALIAS  
--\> new\_index -\> ALIAS

But the problem is that I am pulling the new documents continuously from a database. In this case I have to stop Logstash to write to existing index, then reindex it and switch alias.

Is there any better way to do it without stopping Logstash?

Thanks.

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<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: [November 12, 2023, 1:00pm UTC](https://discuss.elastic.co/t/reindexing-a-big-index-without-down-time/345050/2 "2023-11-12T13:00:20Z")

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