Explain the `script` parameter in the Elasticsearch Reindex API and its common use cases.

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Grade: Education Subject: Ddos
Explain the `script` parameter in the Elasticsearch Reindex API and its common use cases.
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The `script` parameter allows you to modify documents during the reindex process. Common use cases include field renaming, data transformation (e.g., converting data types, concatenating fields), and adding or removing fields. You can use scripts written in the Painless scripting language.