# Merge Old indices with New indices

**URL:** <https://discuss.elastic.co/t/merge-old-indices-with-new-indices/107790>\
**Category:** Elasticsearch\
**Created:** [November 15, 2017, 4:57pm UTC](https://discuss.elastic.co/t/merge-old-indices-with-new-indices/107790 "2017-11-15T16:57:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kevinray0030](https://avatars.discourse-cdn.com/v4/letter/k/71c47a/32.png) [@kevinray0030](https://discuss.elastic.co/u/kevinray0030)\
**Post date:** [November 15, 2017, 4:57pm UTC](https://discuss.elastic.co/t/merge-old-indices-with-new-indices/107790/1 "2017-11-15T16:57:04Z")

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Hello all,

I have recently run into an issue where our Graylog Server wasn't able to bring up search results and it seemed that our ElasticSearch service crashed.  
When it crashed, I noticed that we were running an older version of ElasticSearch and took the opportunity to upgrade the node.

After following the upgrade instructions ([https://www.elastic.co/guide/en/elasticsearch/reference/current/restart-upgrade.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/restart-upgrade.html)), I attempted to start the service, we run this on CentOS 7, and it failed with an error that I didn't understand at the time. With that said, its also possible that I messed up the upgrade somehow and caused the service to not start successfully.

Either way, I blew away the instance and then installed a fresh ElasticSearch node and started everything up fine. When I went to look in my Graylog Server, though, all of our data from the previous 6ish months was missing. Since then, I have found that data in another folder (I didn't realize the DATA\_DIR had been changed originally) but am unsure how to merge that old data back in.

Any help is appreciated.

TL;DR - ElasticSearch crashed, attempted to upgrade and failed, fresh installed, old data isn't showing up in search, need to understand how to get it back in the search history.

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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:** [December 13, 2017, 4:57pm UTC](https://discuss.elastic.co/t/merge-old-indices-with-new-indices/107790/2 "2017-12-13T16:57:12Z")

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