Why using `fields` changes the behavior of default operator?

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1

I have encountered a strange thing while trying to use fields: option in a "query_string" query:

Let's assume we have an entity and when using a query such as:

"query_string" : {
    "default_operator" : "AND",
    "query" : "the thing"
}

it returns some documents.

But for a strange reason, when I post the same query but list all the fields explicitly, it doesn't work anymore, i.e.,

"query_string" : {
    "default_operator" : "AND",
    "fields" : ["description",
                "short_description",
                "title"],
    "query" : "the thing"
}

However, if I change the default_operator:

"query_string" : {
    "default_operator" : "OR",
    "fields" : ["description",
                "short_description",
                "title"],
    "query" : "the thing"
}

It does work again. Can someone explain why?

2

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