Elastic sorting by most matches of filtered array - sorting

Question

I have documents like:
{
id : 1,
title : One,
tags : {
{id : 1, title : One},
{id : 2, title : Two},
{id : 3, title : Three},
}
},
{
id : 2,
title : Two,
tags : {
{id : 1, title : One},
{id : 4, title : Four},
{id : 5, title : Five},
}
},
{
id : 3,
title : Three,
tags : {
{id : 1, title : One},
{id : 2, title : Two},
{id : 4, title : Four},
}
}
I'm filtering by first item's tags.id:
{
"query": {
"filtered": {
"filter": {
"bool": {
"must_not": {
"ids": {
"values": [1]
}
},
"should": [
{
"term": {
"tags.id": "1"
}
},
{
"term": {
"tags.id": "2"
}
},
{
"term": {
"tags.id": "3"
}
}
]
}
}
}
},
"track_scores": true,
"size": 20,
"sort": {
"_score": "desc"
}
}
Is there any way to get result ordered by most matching tags? In this case item Three (2 matches) should be first and then item Two (1 match).
It seems if I use filter without a query, then the score is 1 for all items.

Answer 1

What about this:
{
"query" : {
"bool": {
"must_not": {
"ids": {
"values": [1]
}
},
"should": [
{
"constant_score" : {
"filter" : {
"term": {
"tags.id": "1"
}
}
}
},
{
"constant_score" : {
"filter" : {
"term": {
"tags.id": "2"
}
}
}
},
{
"constant_score" : {
"filter" : {
"term": {
"tags.id": "3"
}
}
}
}
]
}
}
}
This query will ensure that the record with id = 1 is not on of the results and that the results are ordered such that the results with more matching tags come before the results with fewer matching tags.
Based on what you are looking for in the description you provided so far, I don't think the filtered query is necessary. The must_not clause will filter out the undesired result. The bool query with its defaults will handle the ordering you want.

Answer 2

Probably #eemp's answer would work too, but I prefer to leave filter where possible, so it wouldn't be taken in to account on score count. So I moved tgas filter to query.
{
"query": {
"filtered": {
"filter": {
"bool": {
"must_not": {
"ids": {
"values": [1]
}
}
}
},
"query": {
"bool": {
"should": [
{
"term": {
"tags.id": "1"
}
},
{
"term": {
"tags.id": "2"
}
},
{
"term": {
"tags.id": "3"
}
}
]
}
}
}
},
"size": 20
}