child "elasticsearch" fails because [child "indices" fails because ["indices" at position 0 fails because ["allow_restricted_indices" is not allowed], "indices" at position 1 fails because ["allow_restricted_indices" is not allowed]]]
Is this the full message ? You mentioned you get this in the UI but this looks more like a settings validation error. Do you have an elasticsearch.indices.allow_restricted_indices setting in your kibana.yml ?
Which Kibana version and Elasticsearch version are you using ?
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