It's a "feature" of the query_string. What's happening is this query:
sofa OR rugs AND red
Actually means "rugs" and "red" must be there (always) to match. And if a
document is a match (i.e. it contains both rugs and red) and it contains
sofa also, then boost that document up some more ahead of the others.
This query:
sofa OR (rugs AND red)
Actually means either "sofa" is there, or ("rugs" and "red") is there to be a
match. This is what you expect as normal boolean logic.
The easiest way to see and understand whats happening is to use the _validate
API like this:
curl -XPOST "http://localhost:9200/f/_validate/query?explain&pretty"; -d '
{
"query": {
"query_string": {
"query": "sofa OR rugs AND red",
"default_operator": "AND"
}
}
}'
If you _validate/explain the other query, you will understand how it is
"interpreted".
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