# ESM tool migration

**URL:** <https://discuss.elastic.co/t/esm-tool-migration/303521>\
**Category:** Elasticsearch\
**Created:** [April 28, 2022, 1:39pm UTC](https://discuss.elastic.co/t/esm-tool-migration/303521 "2022-04-28T13:39:55Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![iliyab09](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/iliyab09/32/104827_2.png) [@iliyab09](https://discuss.elastic.co/u/iliyab09)\
**Post date:** [April 28, 2022, 1:39pm UTC](https://discuss.elastic.co/t/esm-tool-migration/303521/1 "2022-04-28T13:39:55Z")

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Hello  
I have couple questions about migration, can't find the information nowhere.

- When the migration is in progress do I need to stop read write to my old cluster?

- When the migration is done I can just connect to that new cluster and continue using it?  
I mean all the indexes will be in place and new writing will be continuing to the same (new) indexes?

- Can I stop the migration progress any time? can it somehow damage my old cluster/indexes?  
Thank for the help.

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [April 28, 2022, 10:14pm UTC](https://discuss.elastic.co/t/esm-tool-migration/303521/2 "2022-04-28T22:14:37Z")

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Welcome to our community! 😃

Can you clarify what ESM is?

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**Author:** ![iliyab09](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/iliyab09/32/104827_2.png) [@iliyab09](https://discuss.elastic.co/u/iliyab09)\
**Post date:** [April 29, 2022, 9:02am UTC](https://discuss.elastic.co/t/esm-tool-migration/303521/3 "2022-04-29T09:02:24Z")

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Sorry with all those questions I forgot to mention it.

It's an Elasticsearch Migration Tool.

Elasticsearch cross version data migration.

Cross version Elasticsearch data migration with ESM]([Dec 3rd, 2020: [EN] Cross version Elasticsearch data migration with ESM](https://discuss.elastic.co/t/dec-3rd-2020-en-cross-version-elasticsearch-data-migration-with-esm/256516))

## Features:

- Cross version migration supported
- Overwrite index name
- Copy index settings and mapping
- Support http basic auth
- Support dump index to local file
- Support loading index from local file
- Support http proxy
- Support sliced scroll ( elasticsearch 5.0 +)
- Support run in background
- Generate testing data by randomize the source document id
- Support rename filed name
- Support unify document type name
- Support specify which \_source fields to return from source
- Support specify query string query to filter the data source
- Support rename source fields while do bulk indexing
- Load generating with

> **[GitHub - medcl/esm: An simple Elasticsearch migration tool.](https://github.com/medcl/esm)**
>
> An simple Elasticsearch migration tool.

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<div class="post-metadata">

**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [May 2, 2022, 12:12am UTC](https://discuss.elastic.co/t/esm-tool-migration/303521/5 "2022-05-02T00:12:22Z")

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Thanks!

That tool is written and maintained by an ex-Elastician and is not an official Elastic tool. You'd need to ask them how it handles the migration aspects.

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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:** [May 30, 2022, 12:12am UTC](https://discuss.elastic.co/t/esm-tool-migration/303521/6 "2022-05-30T00:12:35Z")

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