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---
mapped_pages:
- https://www.elastic.co/guide/en/elasticsearch/client/curator/current/option_migration_prefix.html
---
# migration_prefix [option_migration_prefix]
::::{note}
This setting is used by the [reindex](/reference/reindex.md) action.
::::
If the destination index is set to `MIGRATION`, Curator will reindex all selected indices one by one until they have all been reindexed. By configuring `migration_prefix`, a value can prepend each of those index names. For example, if I were reindexing `index1`, `index2`, and `index3`, and `migration_prefix` were set to `new-`, then the reindexed indices would be named `new-index1`, `new-index2`, and `new-index3`:
```yaml
actions:
1:
description: >-
Reindex index1, index2, and index3 with a prefix of new-, resulting in
indices named new-index1, new-index2, and new-index3
action: reindex
options:
wait_interval: 9
max_wait: -1
migration_prefix: new-
request_body:
source:
index: ["index1", "index2", "index3"]
dest:
index: MIGRATION
filters:
- filtertype: none
```
`migration_prefix` can be used in conjunction with [*migration_suffix*](/reference/option_migration_suffix.md)
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