Geo distance sort point value

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1

Hi,
Why we need the point value, in the sort request?
GET /_search
{
"sort" : [
{
"_geo_distance" : {
"pin.location" : [-70, 40],
"order" : "asc",
"unit" : "km"
}
}
],
"query" : {
"term" : { "user" : "kimchy" }
}
}

2

How would you sort by distance to a given point if you don't set this point?

3

I got it.
Thanks

4

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