Elasticsearch does not found an existing document using a the DSL - elasticsearch

Question

I dont know why, using the URI Search way to search a document is returning the right document, but the document is not found if I use the API DSL.
To reproduce the issue:
Without any index created, I insert this document:
curl http://localhost:9299/integrationtest-index/searchable/ID_XXXX2 -d '{ "ref" : "XXXX2", "field1" : "value1" }'
So the index is created automatically with the default mapping (type searchable):
curl http://localhost:9299/integrationtest-index?pretty
{
"integrationtest-index" : {
"aliases" : { },
"mappings" : {
"searchable" : {
"properties" : {
"field1" : {
"type" : "string"
},
"ref" : {
"type" : "string"
}
}
}
},
"settings" : {
"index" : {
"field1" : "value1",
"ref" : "XXXX2",
"number_of_shards" : "5",
"creation_date" : "1466780216631",
"number_of_replicas" : "1",
"uuid" : "GBj2VF-wQy6JP74AqoIn5g",
"version" : {
"created" : "2020099"
}
}
},
"warmers" : { }
}
}
This query return one document:
curl http://localhost:9299/integrationtest-index/searchable/_search?q=ref:XXXX2
But this other query response that does not exist:
curl -XPOST http://localhost:9299/integrationtest-index/searchable/_search/exists -d '
{
"query": {
"term" : {
"ref" : "XXXX2"
}
}
}'
Why the last query said that the document does not exist?
Environment:
ElasticSearch 2.2.0
Ubuntu 16.04 LTS
OpenJDK Runtime Environment (build 1.8.0_91-8u91-b14-0ubuntu4~16.04.1-b14)

Answer 1

I have the same problem every few months, so I decided response myself and share my stupids errors.
By default, elasticsearch use index:analyzed, so the query with term does not found any document.
If you use the URI Search way, elasticsearch is executing a query_string and not a term query.
This query is working:
curl -XPOST http://localhost:9299/integrationtest-index/searchable/_search/exists -d '
{
"query": {
"match" : {
"ref" : "XXXX2"
}
}
}'
More information in the documentation, in the section Why doesn’t the term query match my document?