Multi-value field scoring

Elastic Stack Elasticsearch
1

Hey,

I'm trying to find a way in ES or in Lucene to change the scoring of a multi
-value field.
Today it looks like that the multi-value field is being treated as bag of
words.
I want to be able to calculate the score per each value in the multi-value and
use the max scored value in the document score at the end.

For example:

  1. id: 1, Title: "new Sony Playstation", "ps 3", "game console for TV"
  2. id: 2, Title: "Sony Playstation", "console game 3", "brand new
    Playstation 3"
  3. id: 3, Title: "Brand sony console", "Best console sony playstation",
    "new sony playstation 3"

Input keywords: "sony, "new", "playstation"
The order of the result should be: #1, #2, #3

ES will return the results as follow because #2, #3 has more keywords and
#1 has other keywords in the title which aren't relevant to what I'm
searching:
id: 2, Title: Sony Playstation, console game 3, brand new Playstation 3
id: 3, Title: Brand sony console, Best console sony playstation, new sony
playstation 3
id: 1, Title: new Sony Playstation, ps 3, game console for TV

Is there any specific query or customization I can do in order to change
the scoring? The only way I thought about is to break these title into
different documents which doesn't look like the best solution but it seemed
like there is no other option.

Thanks,
Itay

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