Elasticsearch completion : strange behavior when multiple matches per document - elasticsearch

Question

When I use the completion type inside a suggest as described in the ElasticSearch documentation (https://www.elastic.co/guide/en/elasticsearch/reference/6.7/search-suggesters-completion.html), I do not manage to get all the matching words (I only get one matching word per document)
I test the following commands on my ElasticSearch 6.7.2 (which is the latest available on AWS at this moment) :
Deleting the index in case it exists
curl http://localhost:9200/test -H 'Content-Type: application/json' -X DELETE
Creating the index
curl http://localhost:9200/test -H 'Content-Type: application/json' -X PUT -d '
{
"mappings": {
"page": {
"properties": {
"completion_terms": {
"type": "completion"
}
}
}
}
}
'
Indexing a document
curl http://localhost:9200/test/_doc/1 -H 'Content-Type: application/json' -X PUT -d '
{
"completion_terms": ["restaurant", "restauration", "réseau"]
}'
Check the document exists
curl http://localhost:9200/test/_doc/1 -H 'Content-Type: application/json'
Use the completion
curl -X GET "localhost:9200/test/_search?pretty=true" -H 'Content-Type: application/json' -d'
{
"_source": ["suggestExact"],
"suggest": {
"suggestExact" : {
"prefix" : "res",
"completion" : {
"field" : "completion_terms"
}
}
}
}
'
The result is :
{
"took" : 6,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : 0,
"max_score" : 0.0,
"hits" : [ ]
},
"suggest" : {
"suggestExact" : [
{
"text" : "res",
"offset" : 0,
"length" : 3,
"options" : [
{
"text" : "restaurant",
"_index" : "test",
"_type" : "page",
"_id" : "1",
"_score" : 1.0,
"_source" : { }
}
]
}
]
}
}
I'd like to get ALL the matching words (here, I get at most one result per document)
In the example, "restauration" and "réseau" are missing
Am I doing something wrong ?

Answer 1

After many searches, I found that this is the intended behavior (that is to "suggest documents", instead of "suggest terms")
Especially, see https://github.com/elastic/elasticsearch/issues/31738
However, I still do not manage to achieve "suggest terms" even with the term suggester which seems to be the correct way (https://www.elastic.co/guide/en/elasticsearch/reference/6.7/search-suggesters-term.html)