Highlight_query is ignored ES 2.3.4

I need to highlight only fragment containing all searched words specified in the highlight_query, but it is ignored. What am i mistaking?

GET /test/person/_search
{
"query": {
"terms": {
"testo": ["favola", "fiaba"]
}
},
"highlight": {
"order": "score",
"fields": {
"testo": {
"query": {
"terms": {
"testo": ["favola", "fiaba"]
}
}
}
}
}}

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