Problem in multi match search

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 :{
            index: 'equipments',
            size: 15,
            from: 0,
            query: {
                        multi_match: {
                            fields: [
                                // 'attribute^2',
                            query: text,

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

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