In order to use in the search index custom fields created in your module (for example: Movie Author), you need to add this additional custom fields on both places:
1) Administration > Search indexes
> <your index> > Advanced > Additional fields for indexing
(Note that these fields should be of type short or long text)
2) Search result page > Search results Widget
> Edit > Advanced > SearchFields
(separated by comma)
I have tested it on my end and it works fine.
What I have tested: I have created a New module with content item fields: Movie title, author, etc. and add the additional fields as described above. The search results returns the movie searched by author also (here
you could see how it works).
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