Elastic reindex documents with new fields

Hi - What's the best way to update an existing index with new field added to it? For eg:

Current index has fields, firstName,lastName,streetNo,City,Zipcode.

I would like to add one more field called FullAddress - which is a concatenation of streetNo,City,ZipCode.

Reindex will not allow to use same index as destination, as I need to update all existing documents as well in the index.


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