boost the score relative to term location in field elasticsearch

Question

Query

{"query":{"query_string":{"query":"name:pi*"}}}

Out put

hits: [
{
    _score: 1
    _source: {
        handle: PIXIES
        name: Pixies
    }
}
{
    _score: 1
    _source: {
        handle: twentyonepilots
        name: twenty one pilots
    }
}
{
    _score: 1
    _source: {
        handle: Antonio_Pinto
        name: Antonio Pinto
    }
}
{
    _score: 1
    _source: {
        handle: null
        name: Piano Tribute Players
    }
}
{
    _score: 1
    _source: {
        handle: null
        name: Los Pinguos
    }
}
{
    _score: 1
    _source: {
        handle: null
        name: Piyush Mishra & Bhupesh Singh
    }
}
{
    _score: 1
    _source: {
        handle: pinkfloyd
        name: Pink Floyd
    }
}]

If you look at the results it matches the terms in name with pi*, which is what I expect from the above query.

But how to write a query to sort results with term location(position index) in the field. The results of that query should make Piano Tribute Players, Pink Floyd to pop up on the top of list. Since they begin with pi*

similar question on solr: SOLR: Boosting based on location of search term in field