Rename index using script processor

Hello all.

I see in

https://www.elastic.co/guide/en/elasticsearch/reference/6.5/script-processor.html

that "Using the above pipeline, we can attempt to index a document into the any_index index"

I have made a test and it works. But it is done document by document.

My question is:
In order to rename an index, is it worth working on a pipeline or procedure based on the above or the preferred method is still reindexing?

Thank you very much.

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