ElasticSearch can't get multiple suggestor values from the same document - node.js

Question

Can you help me please?
I have a problem with Completion Suggester in ElasticSearch
Example: I have this mapping :
PUT music
{
"mappings": {
"properties": {
"suggest": {
"type": "completion"
},
"title": {
"type": "keyword"
}
}
}
}
and index multiple suggestions for a document as follows:
PUT music/_doc/1?refresh
{
"suggest": [
{
"input": "Nirva test",
"weight": 10
},
{
"input": "Nirva hola",
"weight": 3
}
]
}
Querying: you can do this request on kibana
POST music/_search?pretty
{
"suggest": {
"song-suggest": {
"prefix": "nirv",
"completion": {
"field": "suggest"
}
}
}
}
and the result I retrieve only the first value but not both.
I did the test on kibana dev tool too and this is the result
{
"took" : 1,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 0,
"relation" : "eq"
},
"max_score" : null,
"hits" : [ ]
},
"suggest" : {
"song-suggest" : [
{
"text" : "nir",
"offset" : 0,
"length" : 3,
"options" : [
{
"text" : "Nirvana test",
"_index" : "music",
"_type" : "_doc",
"_id" : "1",
"_score" : 10.0,
"_source" : {
"suggest" : [
{
"input" : "Nirvana test",
"weight" : 10
},
{
"input" : "Nirvana best",
"weight" : 3
}
]
}
}
]
}
]
}
}
expected result :
"suggest" : {
"song-suggest" : [
{
"text" : "nirvana",
"offset" : 0,
"length" : 7,
"options" : [
{
"text" : "Nirvana test",
"_index" : "music",
"_type" : "_doc",
"_id" : "1",
"_score" : 10.0,
"_source" : {
"suggest" : [
{
"input" : "Nirvana test",
"weight" : 10
},
{
"input" : "Nirvana best",
"weight" : 3
}
]
}
}
]
},
{
"text" : "nirvana b",
"offset" : 0,
"length" : 9,
"options" : [
{
"text" : "Nirvana best",
"_index" : "music",
"_type" : "_doc",
"_id" : "1",
"_score" : 3.0,
"_source" : {
"suggest" : [
{
"input" : "Nirvana test",
"weight" : 10
},
{
"input" : "Nirvana best",
"weight" : 3
}
]
}
}
]
}
]
}

Answer 1

This is the default behavior of current implementations. You can check #31738. Below is one of the comment for an explanation why it is returning only one document/suggestion.
The completion suggester is document-based by design so we cannot
return one entry per matching suggestion. It is documented that it
returns documents not suggestions and a single input can be indexed in
multiple suggestions (if you have synonyms in your analyzer for
instance) so it is not trivial to differentiate a match from its
variations. Also the completion suggester does not visit all
suggestions to select the top N, it has a special structure (a
weighted FST) that can visit suggestions in the order of their scores
and early terminates the query once enough documents have been found.