Why constant_score not work with boost in elasticsearch

Elastic Stack Elasticsearch
1

Hi,

I am using constant score with query string but when i search with boost in constant_score it always give score 1

this is my query

{
"query":{
"constant_score":{
"query":{
"query_string":{
"query":"(MOOLCHAND HEALTHCARE PVT.LTD)",
"fields":[
"providerName",
"email",
"website"
],
"default_operator":"OR"
}
},
"boost":1000
}
}
}

please tell me what's going wrong in this query

Thanks