API call to elasticsearch

Hello everyone,
I am thinking to something and I am not sure if it is possible and i was thinking you can guide or say if it is possible or not
So I want to query directly the Elasticsearch, get the output in csv or whatever, processes the output, and after that post the processed output into an new index and after this is done 1st time, the processed output to be ingested to the same index as a different document of course. There will be a new field created in the processing phase. I will post an image to make it more clearly.

PS. It does not matter the programing language.

So please let me know if this is possible.
Thank you,

Yes that's possible.

Hi, thank you.
Is there any documentation how can I get the data and ingest new data ?


Logstash will get data, do processing and then send back to another index. But whether or not that will work really depends on what you are looking to do with the processing side of things.

aa ok, understood, i just want to ingest it in another fields, but I managed to get the dat with a python client

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