Search Special Tags

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Hi, I have a paid theme where product tags starting with two underscores(__) are excluded from filter by tag in collection pages. I sell books and have added the book authors using a metafield app, but I noticed customers can't search this products by their author because shopify doesn't search product metafields value. So I tried adding the book authors as a tag with double underscore as prefix(__Author Name), but I noticed shopify search still doesn't get these products when I search for the Author Name except I include the two underscore in the search. So is there a way I could modify the search file to ignore the two underscores during search?