Reindexing with a script including hashing

we are currently looking into reindexing our indices and adding a new field which is the hash fingerprint of a larger field. Our approach is to pass the script to the reindexing api, but it won't work.

Our request:

  "source": {
    "index": "source"
  "dest": {
    "index": "destination"
  "script": {
    "lang": "painless",
    "source": "ctx._source['hashfield'] = ctx._source['data'].sha256()"

But we are facing the following error: dynamic method [java.lang.String, sha256/0] not found, but according to that PR - this should be working? Any ideas how to tackle this?

Best, Hannes

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