Undefined array key "rendered"

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Problem/Motivation

Getting this warning in the output.
Warning: Undefined array key "rendered" in modules/contrib/rest_views/modules/rest_views_search_api/src/Plugin/views/field/SearchApiEntityFieldExport.php

Steps to reproduce

1. Create a view with Search API index
2. Use Facets serializer or Serializer for Format
3. Use Fields

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes