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keithhc2 2021-07-21 11:31:27 -07:00
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_opensearch/rest-api/update-mapping.md
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# Update mapping
If you want to update an index's mappings after creating the index, you can do so with the update mapping API operation.
If you want to update an index's mappings to add or update field types after index creation, you can do so with the update mapping API operation.
Note that you cannot use this operation to update mappings that already map to existing data in the index. You must first create a new index with your desired mappings, and then use the [reindex API operation]({{site.url}}{{site.baseurl}}/opensearch/reindex-data) to map all the documents from your old index to the new index. If you don't want any downtime while reindexing your indices, you can use [aliases]({{site.url}}{{site.baseurl}}/opensearch/index-alias).
## Example