I have a view that I set it up with Search Api and Facet Api, I couldn't display the body field of indexed nodes.
I tried to add it to the Search Api index fields but it still the same result.
There are 2 solutions to add body field:
Create view mode with body field in it.
Now in view, use Rendered entity instead of fields.
Note: You always need to do reindexing whenever you add or remove field form search api index field configuration.