Modify the documents while reindexing

Elastic Stack Elasticsearch
1

Hi,
Can we modify the documents while reindexing ? Example: Suppose a document at source index contains a field "user" = "gmail" and while reindexing from source to destination shall we change the "user" = "facebook" at destination index? or after reindex we have to update by separate update command?

2

You can provide a script while reindexing.
See https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-reindex.html

3

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