Elasticsearch mongoDb River + Native Script Plugin

Elastic Stack Elasticsearch
1

I am currently trying to run a nativescript with the "script" property of
the river configuration. The script is starting as expected but the problem
is that doc() is always null and I can't access any fields of the document
to run my document transformation.

Any idea how to solve this?
public class LambertToWgs84Script extends AbstractSearchScript {

public static class Factory implements NativeScriptFactory {

@Override
public ExecutableScript newScript(@Nullable
                                  Map<String, Object> params) {

  return new LambertToWgs84Script(params);
}

}

@Override
public Object run() {
// Get xy Values
Long x = (Long) doc().get(
"realEstateCommonData.locationDto.geoCoordinateDto.xCoordinate");
Long y = (Long) doc().get(
"realEstateCommonData.locationDto.geoCoordinateDto.yCoordinate");

// Transformation

// Write Coordinates back
JSONObject newLocation = new JSONObject();
try {
  newLocation.put("Type", "Point");
  JSONArray coords = new JSONArray();
  coords.put("bla");
  coords.put("blub");
  newLocation.put("coordinates", coords);
  doc().put("location", newLocation);
} catch (JSONException e) {
  e.printStackTrace();
}

return true;

}
}

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