# Documents lost when upgrading from 0.11 to 0.13

**URL:** <https://discuss.elastic.co/t/documents-lost-when-upgrading-from-0-11-to-0-13/3640>\
**Category:** Elasticsearch\
**Created:** [December 7, 2010, 10:50pm UTC](https://discuss.elastic.co/t/documents-lost-when-upgrading-from-0-11-to-0-13/3640 "2010-12-07T22:50:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![John\_Chang](https://avatars.discourse-cdn.com/v4/letter/j/ecc23a/32.png) [@John\_Chang](https://discuss.elastic.co/u/John_Chang)\
**Post date:** [December 7, 2010, 10:50pm UTC](https://discuss.elastic.co/t/documents-lost-when-upgrading-from-0-11-to-0-13/3640/1 "2010-12-07T22:50:33Z")

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We upgraded from Elastic Search 0.11 and 0.13. We monitor the number of docs and found that 10% disappeared right when we did our upgrade. All our mappings are in place, BTW.

We are currently working on a reindex correction script, but in the meantime...is this a known issue? Any recovery suggestions? Would 0.13.1 help?

Thanks.

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**Author:** ![kimchy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kimchy/32/44952_2.png) [@kimchy](https://discuss.elastic.co/u/kimchy)\
**Post date:** [December 8, 2010, 7:09am UTC](https://discuss.elastic.co/t/documents-lost-when-upgrading-from-0-11-to-0-13/3640/2 "2010-12-08T07:09:15Z")

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Its not an issue that I am aware of. It might be that the index got corrupted and when the cluster restarted, you lost the docs. That bug was fixed in 0.13. Note the upgrade notes on the routing changes and the flag to have a backward compatible behavior.  
On Wednesday, December 8, 2010 at 12:50 AM, John Chang wrote:

> We upgraded from Elastic Search 0.11 and 0.13. We monitor the number of docs  
> and found that 10% disappeared right when we did our upgrade. All our  
> mappings are in place, BTW.
> 
> We are currently working on a reindex correction script, but in the  
> meantime...is this a known issue? Any recovery suggestions? Would 0.13.1  
> help?
> 
> ## Thanks.
> 
> View this message in context: [http://elasticsearch-users.115913.n3.nabble.com/Documents-lost-when-upgrading-from-0-11-to-0-13-tp2036836p2036836.html](http://elasticsearch-users.115913.n3.nabble.com/Documents-lost-when-upgrading-from-0-11-to-0-13-tp2036836p2036836.html)  
> Sent from the Elasticsearch Users mailing list archive at [Nabble.com](http://Nabble.com).

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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:** [July 6, 2017, 4:15am UTC](https://discuss.elastic.co/t/documents-lost-when-upgrading-from-0-11-to-0-13/3640/3 "2017-07-06T04:15:32Z")

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Closed on July 6, 2017, 4:15am UTC