Multi type & multi_match query - individual boosting

I have two types: books, compositions. Both of them have an author (string) field: and

I would like to search in both of the two types at the same time, with multi_match query, like:

GET /my_index/book,composition/_search
"query": {
    "multi_match" : {
        "query" : "Beethoven",
        "fields" : [ "author", "title" ]

But the book's author is more important for me, so I need to boost it. How could I boost 3x times higher the than the


Check out the index boost query


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