boost specific titles

boost_by_id.json

{
    "query": {
        "function_score": {
            "query": {
                "multi_match": {
                    "query": "gospel",
                    "fields": [
                        "title.raw^60",
                        "authors.raw^40",
                        "subjects.raw^20",
                        "title",
                        "authors",
                        "subjects"
                    ]
                }
            },
            "functions": [
                {
                    "filter": {
                        "term": {
                            "_id": "promoted_gosped_book"
                        }
                    },
                    "boost_factor": 5
                }
            ]
        }
    }
}

boost_by_title.json

{
    "query": {
        "bool": {
            "must": {
                "multi_match": {
                    "query": "gospel",
                    "fields": [
                        "title.raw^60",
                        "authors.raw^40",
                        "subjects.raw^20",
                        "title",
                        "authors",
                        "subjects"
                    ]
                }
            },
            "should": {
                "match": {
                    "title.raw": {
                        "query": "promoted gospel book",
                        "boost": 5
                    }
                }
            }
        }
    }
}