How to perform exact string match query in ES

Elastic Stack Elasticsearch
3

Thank you for your response. I'm using one of the Keyword field to find data from ES. ANd i got an udpated script but still this is also not work .

GET default-2018.*/_search
{
"query": {
"query_string" : {
"default_field" : "message",
"query" : "Found valid data. Can proceed to click the link.",
"phrase_slop": 0
}
}
}

Here, ES is giving results which are having atleast one word in any log instead of giving only exact match. How i can format above query to get only exact matching results ?