# Lucene to ES index migration
**URL:** https://discuss.elastic.co/t/lucene-to-es-index-migration/12197
**Category:** Elasticsearch
**Created:** [May 30, 2013, 10:09pm UTC](https://discuss.elastic.co/t/lucene-to-es-index-migration/12197 "2013-05-30T22:09:24Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Vijai\_Singh](https://discuss.elastic.co/u/Vijai_Singh)
#### Post date: [May 30, 2013, 10:09pm UTC](https://discuss.elastic.co/t/lucene-to-es-index-migration/12197/1 "2013-05-30T22:09:24Z")
Hi All,
We are migrating from Lucene to ES. The only piece that is not coming
together is the pain associate with having to reindex all the indexes out
there.
Want to know if anyone has solved the problem of migrating Lucene indexes
to ES. We have the documents stored with indexes.
Thanks
Vijai
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### Author:  [@Igor\_Motov](https://discuss.elastic.co/u/Igor_Motov)
#### Post date: [May 31, 2013, 1:49am UTC](https://discuss.elastic.co/t/lucene-to-es-index-migration/12197/2 "2013-05-31T01:49:58Z")
Vijai,
You will have to reindex. Although, Elasticsearch is using Lucene library,
it relies on a certain special fields (such as uid for example) to be
indexed in a certain way. So, it's unlikely that your index in its current
state will be compatible with Elasticsearch.
Igor
On Thursday, May 30, 2013 6:09:24 PM UTC-4, Vijai Singh wrote:
> Hi All,
>
> We are migrating from Lucene to ES. The only piece that is not coming
> together is the pain associate with having to reindex all the indexes out
> there.
>
> Want to know if anyone has solved the problem of migrating Lucene indexes
> to ES. We have the documents stored with indexes.
>
> Thanks
> Vijai
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### Author:  [@Vijai\_Singh](https://discuss.elastic.co/u/Vijai_Singh)
#### Post date: [June 5, 2013, 6:23pm UTC](https://discuss.elastic.co/t/lucene-to-es-index-migration/12197/3 "2013-06-05T18:23:14Z")
Thanks Igor.
On Friday, May 31, 2013 7:19:58 AM UTC+5:30, Igor Motov wrote:
> Vijai,
>
> You will have to reindex. Although, Elasticsearch is using Lucene library,
> it relies on a certain special fields (such as uid for example) to be
> indexed in a certain way. So, it's unlikely that your index in its current
> state will be compatible with Elasticsearch.
>
> Igor
>
> On Thursday, May 30, 2013 6:09:24 PM UTC-4, Vijai Singh wrote:
>
> > Hi All,
> >
> > We are migrating from Lucene to ES. The only piece that is not coming
> > together is the pain associate with having to reindex all the indexes out
> > there.
> >
> > Want to know if anyone has solved the problem of migrating Lucene indexes
> > to ES. We have the documents stored with indexes.
> >
> > Thanks
> > Vijai
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 2:32am UTC](https://discuss.elastic.co/t/lucene-to-es-index-migration/12197/4 "2017-07-06T02:32:42Z")