Elasticsearch Version

8.13.4

Installed Plugins

No response

Java Version

bundled

OS Version

Windows 10

Problem Description

Hello,
when setting up a score calculation script I notice that the ExplanationHolder object is always null which makes it impossible to add a description on this object.
The example iused is this example
you can see on lines 144 and 168 ExplanationHolder is always null and you can not add a custom description.
explanation.set(myCustomdescription);

Steps to Reproduce

• install plugin on elasticsearch
• do a search with a score calculation function

Logs (if relevant)

No response