Fielddata is not supported on field _version

Elastic Stack Elasticsearch
1

I am facing this exception when trying to get _version field from a Script:

java.lang.IllegalArgumentException: Fielddata is not supported on field [_version] of type [_version]

Looking at elasticsearch documentation it seems fielddata is disabled on text fields by default.

https://www.elastic.co/guide/en/elasticsearch/reference/current/fielddata.html

Why are we getting this on _version? How can we get _version from our script that is extending AbstractSearchScript?

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