[RSS Feed/News] Local OpenSearch 2.8 doesn't work?

[XenForo]

I have been trying to replace elasticsearch 8.x with OpenSearch 2.8.x but currently facing a bug?.

Currently getting the following when initiating initially Xenforo Enhanced Search fresh install :

XFES\Elasticsearch\RequestException: Root mapping definition has unsupported parameters: [xfmg_comment : {_source={enabled=false}, _all={enabled=false}, properties={date={store=true, type=long}, hidden={type=boolean}, content_type={type=string}, content_id={type=long}...
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