Query string query "field" vs boolean OR operator

From what I see and understand this...

curl -XPOST 'http://localhost:9200/index_1/type_1/_search' -d '{
"query": {
"query_string": {
"fields": ["field1", "field2"],
"query": "green apple"
}
}
}'

returns the same results as this...

curl -XPOST 'http://localhost:9200/index_1/type_1/_search' -d '{
"query": {
"query_string": {
"query": "field1:(green apple) OR field2:(green apple)"
}
}
}'

Which one is more efficient (faster)?

Thanks in advance,
Xavi

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