Sort Elasticsearch results based on field value - elasticsearch

Question

Assuming I have 3 documents (users), and they have knowledge of multiple programming languages - with scores associated, as described below, how can I search for multiple fields (multi-match for example), and if some search-keywords hits a language, sort by its score?
// user1
{
"name": "John Bayes",
"prog_langs": [
{
"name": "python",
"score": 10
},
{
"name": "java",
"score": 500
}
]
}
// user2
{
"name": "John Russel",
"prog_langs": [
{
"name": "python",
"score": 100
},
{
"name": "PHP",
"score": 200
}
]
}
// user3
{
"name": "Terry Guy",
"prog_langs": [
{
"name": "C++",
"score": 600
},
{
"name": "Javascript",
"score": 200
}
]
}
For example: searching "John python"
Should return user1 and user2, but user2 showing up first
**I've been trying to use sort and functions, but I think they always use lowest/highest/average values of score.
Thanks!
[Edit]
**In the meantime I got it working in a testing way to see if without full-text/multi-matched works, and I found out I had to make "prog_langs" nested, so I changed the mapping and it works as expected.
Now I'm only missing the part where a full-text search with multi-match merges with current query.
Thanks again!

Answer 1

I managed to fix the query and now it's working as expected.
Before posting my solution, just have to leave a few things to keep in mind:
I made a new mapping, and added some nested objects, so my original query had to suffer some changes (prog_langs are now of type nested)
I wanted at least two fields to match, being mandatory which should match at least once
{
"query": {
"bool": {
"must": [
{
"query": {
"match": {
"name": {
"query": "john python",
"boost": 5
}
}
}
},
{
"bool": {
"should": [
{
"nested": {
"path": "prog_langs",
"query": {
"match": {
"prog_langs.name": {
"query": "john python",
"boost": 5
}
}
}
}
}
]
}
}
],
"should": [
{
"function_score": {
"query": {
"match": {
"prog_langs.name": "john python"
}
},
"functions": [
{
"script_score": {
"script": "_score * (1 + doc['prog_langs.score'].value)"
}
}
]
}
}
]
}
},
"highlight": {
"fields": {
"name": {},
"prog_langs.name": {}
}
}
}