Mongoose, cannot create text index with default_language: 'none'

Question

I try to create search feature using $text and $search in mongoose but it stuck when the query meet mongodb english stop words . I try to change my default_language to none to ignore the stop words list but then I realized that I cannot change the default_language.

I was wondering the way my mongoose always create index with default_language: english, even I directly use default_language: 'none' .

Here is my code:

kataSchema.index({ kata: "text" }, { default_language: 'none' });

and then when I open mongo shell and type db.katas.getIndexes(), it's always showing me this:

[
    {
        "v" : 2,
        "key" : {
            "_id" : 1
        },
        "name" : "_id_"
    },
    {
        "v" : 2,
        "key" : {
            "_fts" : "text",
            "_ftsx" : 1
        },
        "name" : "kata_text",
        "background" : true,
        "weights" : {
            "kata" : 1
        },
        "default_language" : "english",
        "language_override" : "language",
        "textIndexVersion" : 3
    }
]

I also try to delete the index in mongo shell and run my code again but it still use english as its default_language.

Do I miss at something or else? I was already searching for it everywhere but still cannot find the issue. Thanks for advice.

mongoose version: "^5.10.0"

Answer 1

I guess the problem comes from the .index itself .. Use createIndexes instead.

In your model's schema, try this:

.
.
.
const Kata = mongoose.model('Kata', kataSchema);
Kata.createIndexes({ kata: "text" }, { default_language: 'none' });

Answer 2

Had quite the same issue with Mongoose 5.10.0 and MongoDB 4.4.0 :

contentSchema.index(
{
    title: "text",
    shortDescription: "text",
    description: "text",
},
{
    weights: {
        title: 10,
        shortDescription: 5,
        description: 1
    },
    default_language: "german",
    name: "SearchIndex"
});

weights and default_language were just ignored. Updating Mongoose:

npm update mongoose

Mongoose is now version 5.10.16 and default_language as well as weights are working correctly without any code modifications.

You will have to drop the wrongly created index first before the new one is applied.