Any performance difference between "must_not" clause and "query_string" with NOT operator?

Elastic Stack Elasticsearch
1

Hi there,

I'm wondering, if there is any performance gain using must_not clause over to query_string using NOT operator (will be used inside filter and should clause).
query_string has obviously shorter scripture, no relevance score needed.

must_not:

{
	"bool": {
		"must_not": [
			{
				"term": {
					"fieldA": {
						"value": "XYZ"
					}
				}
			}
		]
	}
}

query_string:

{
	"query_string": {
		"default_field": "fieldA",
		"query": "NOT XYZ"
	}
}

FieldA is a keyword.

Thanks

2

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