How to get an exact match for a field in Elasticsearch.

elasticsearch_exact_match.md

This method is extremely slow, but if you've tokenized your fields in a certain way and don't want to re-index them to include exact matches, this is a good way to go.

{
    "query" : {
        "filtered" : {
            "query" : {
                "match_all": {}
            },
            "filter" : {
                "script" : {
                    "script" : "_source.name == filename",
                    "params" : {
                        "filename" : "exact_match_value.txt"
                    }
                }
            }
        }
    }
}

What's happening here is that we've included a query to match everything, and then we're filtering the query based on the script. The field that I was looking for did't appear in the actual Elasticsearch document, but it was in a field in the _source, which is why we're using that here. The keys in params can be whatever you want, as long as they appear in the value of the script field.