Problem in multi match search

[Fakeknox]

hello i have 6 different field that i want to search in all of them . im using edge gram analyzer for search and using multi match query and text come from front.
my sample code is :

esClient.search({
            index: 'equipments',
            size: 15,
            from: 0,
            query: {
                bool:{
                    must:{
                        multi_match: {
                            fields: [
                                'model',
                                'title^6',
                                'category^5',
                                'brand^3',
                                'attribute.keyword',
                                // 'attribute^2',
                                'description^4'
                            ],
                            query: text,
                            type:'most_fields',
                        },
                    }
                }
        })

when i search excav it returns every equipments category that start with excav (excavator) and when i search for excav hit it returns all excav and hit that can find (excavator hitachi) but my problem is when i search excav hi it returns a document that doesnt have excav in it