# Topbeat beat.hostname analyzed

**URL:** https://discuss.elastic.co/t/topbeat-beat-hostname-analyzed/36930
**Category:** Beats
**Created:** [December 10, 2015, 11:33pm UTC](https://discuss.elastic.co/t/topbeat-beat-hostname-analyzed/36930 "2015-12-10T23:33:38Z")
**Posts on this page:** 1
**Showing post:** 11

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### Author: ![andrewkroh](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/andrewkroh/32/3784_2.png) [@andrewkroh](https://discuss.elastic.co/u/andrewkroh)
#### Post date: [February 13, 2016, 1:41am UTC](https://discuss.elastic.co/t/topbeat-beat-hostname-analyzed/36930/11 "2016-02-13T01:41:12Z")

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@plonka2000 You would need to re-index your existing data. It takes a bit of work and the way you accomplish the task varies by your technology. Basically you read the data out of ES then re-write it to a new index. See the links below.

[https://www.elastic.co/guide/en/elasticsearch/guide/current/reindex.html](https://www.elastic.co/guide/en/elasticsearch/guide/current/reindex.html)  
[http://david.pilato.fr/blog/2015/05/20/reindex-elasticsearch-with-logstash/](http://david.pilato.fr/blog/2015/05/20/reindex-elasticsearch-with-logstash/)

In the future this will be easier to do: [https://github.com/elastic/elasticsearch/issues/15201](https://github.com/elastic/elasticsearch/issues/15201)

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