How to change the huge amount of data formats of my index pattern at once?

I want to change the data format from default to string.
However it is too many to change from the UI.


Is Reindex API able to use or other Restful API to do so?

Ideally, you should be using a defined mapping in Elasticsearch for the index so that Kibana reads the formats correctly.

So you can create the explicit mapping, and then reindex.

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