Run it in the Query Profiler .. looks like constant score to me.
No it does not look like is is actually scoring to me.
If you look at the details, there is no time on the actual score.
You can even try a constant_score query ... there is less time spent in the filter than the that
GET discuss-test/_search
{
"query": {
"constant_score": {
"filter": {
"term": { "type": "canis" }
},
"boost": 1.2
}
}
}
Take a look...

