Scroll setting on reindex task

Elastic Stack Elasticsearch
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Hi all,

I'm looking at this doc: Scroll | Elasticsearch Reference [5.6] | Elastic

Scroll

While a search request returns a single “page” of results, the scroll API can be used to retrieve large numbers of results (or even all results) from a single search request, in much the same way as you would use a cursor on a traditional database.

Scrolling is not intended for real time user requests, but rather for processing large amounts of data, e.g. in order to reindex the contents of one index into a new index with a different configuration.

It says scroll timeout can be changed for reindexing a lot of data. But I don't see any example showing how to change this param using Reindex API - I guess is the only way to "reindex" an index right ?

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