Elasticsearch with a java application

I m using the Java API and I want to know what is the best way to manipulate data elasticsearch with java application.
I m tired to search how i can manipualte this data.
I have the in index and i have 282848 document, I want to apply a prediction algorithm for each document so I want to do the search with id of each document and store the result with update document in elasticsearch
Is the conversion of json to java object necessary
I have blurred notions
Thank you in advance for your help

Jackson library helps doing the conversion from/to json.

I'd use that.

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