Mongodb multilingual query - mongodb

Question

Material collection represents user submissions.
Default language is defined by the user. Other users can extend first submission with some other languages.
When I request a material, maybe I need more than one language, so I think it fits ok with just one collection where I should support multilanguage.
My current desing is like this (document for testing):
{
"activities": [ "Ficha de actividades", "Juego Colectivo" ],
"files": [ "Asociacion_Profesiones.zip"],
"areas": ["Literatura", "Ciencias Naturales", "Ciencias Sociales" ],
"authors": [
{ "author": "César", "email": "xxx#gmail.com"},
{ "author": "José", "email": "xxxx#gmail.com"}
],
"desc": "La leche, el agua, el vino y la bebida",
"state": 1,
"date": ISODate("2017-01-10 19:40:39"),
"updated": null,
"id": 1,
"language": "spanish",
"images": [],
"license": "Creative Commons BY-NC-SA",
"downloads": 0,
"popular": false,
"title": "La bebida",
"file": "1.zip",
"translations": [
{"language": "english", "title": "Beverages", "desc": "Milk, water, wine and all related with drinking", "authors": [], "files": [], "file": "1.zip", "images": [], "downloads": 0, "state": 1, "created": null, "updated": null},
{"language": "french", "title": "le boisson", "desc": "du lait, de l'eau, du vin, boire", "authors": [], "files": [], "file": "1.zip", "images": [], "downloads": 0, "state": 1, "created": null, "updated": null}
]
}
I create a text index focused on title and descripcion (desc) fields.
db.materials.createIndex({ "title": "text", "desc": "text", "translations.title": "text", "translations.desc": "text"})
I know the user default language, but I don't know how he should make the search.
Imagine an spanish user want to search for drinks:
db.materials.find( { $text: { $search: "drink", $language: "es"} } ).explain(true)
It returns our document. It searches drink, and as "Milk, water, wine and all related with drinking" has drink as stemming for drinking it works ok.
However... if I look for water:
db.materials.find( { $text: { $search: "water", $language: "es"} } ).explain(true)
It returns nothing. water gets converted to wat (as spanish verbs end with er suffix) and "wat" is not found.
Any improvement to my searches?
The only workaround I can imagine is to add language dropdown selector to user searches.