-To change the analyzer of an existing field, you'll have to drop and recreate the entire index (you can't rebuild individual fields). For indexes in production, you can defer a rebuild by creating a new field with the new analyzer assignment, and start using it in place of the old one. Use [Update Index](/rest/api/searchservice/update-index) to incorporate the new field and [mergeOrUpload](/rest/api/searchservice/addupdate-or-delete-documents) to populate it. Later, as part of planned index servicing, you can clean up the index to remove obsolete fields.
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