Using third party API to modify/encrypt value of existing fields of document

I have to encrypt/tokenize an existing field (Integer type) of documents using a specific API that encrypts/decrypts a given value. I have a million document in my index and need to encrypt the value of that particular field.
So, is there a way I can pass that API in the POST body to perform the operation?
OR should I create a Java tool that can talk with both Elasticsearch and the API?

Have the kissanime same question. Need help with this. Anyone letgo has solution?

Regards,
Shane.

I believe you will need to write an external tool.

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