Typo tolerance DisableOnAttributes not working as expected

[cklogs]

Description

When typo tolerance in disabled on an attribute, exact matching queries do not work.

To Reproduce

1. Stand-up a basic meilisearch instance in docker:

version: "3.8"

services:
  meilisearch:
    image: getmeili/meilisearch:v1.12
    container_name: meilisearch
    ports:
      - "7701:7700"
    environment:
      MEILI_NO_ANALYTICS: "true"
      MEILI_ENV: "development"
    volumes:
      - meili_data:/meili_data

volumes:
  meili_data:

2. run:

docker-compose up -d

3. generate a basic dotnet CLI that creates documents, sets searchable attributes, and turns off typo tolerance for a particular attribute.

dotnet new console -n TypoToleranceBugProject
dotnet add package Meilisearch --version 0.16.0
dotnet add package Polly

Program.cs:

using Meilisearch;
using Polly;
using System.Text.Json.Serialization;

var client = new MeilisearchClient("http://localhost:7701");

// 0. Delete index
try
{
    Console.WriteLine("Deleting existing 'products' index if present...");
    var deleteTask = await client.Index("products").DeleteAsync();
    await WaitForTaskAsync(client, deleteTask.TaskUid);
}
catch (MeilisearchApiError)
{
    // Eat exception
}

// 1. Create index
Console.WriteLine("Creating 'products' index...");
var indexTask = await client.CreateIndexAsync("products", primaryKey: "id");
await WaitForTaskAsync(client, indexTask.TaskUid);

// 2. Configure attibute settings
Console.WriteLine("Configuring index settings...");
var attributes = new List<string> { "name", "serialNumber" };
var settingsTask = await client.Index("products").UpdateSettingsAsync(new Settings
{
    SearchableAttributes = attributes,
    FilterableAttributes = attributes,
    SortableAttributes = attributes
});
await WaitForTaskAsync(client, settingsTask.TaskUid);

// 3. Disable typo tolerance for serial number attribute
Console.WriteLine("Disabling typo tolerance for serialNumber...");
var typoSettingsTask = await client.Index("products").UpdateSettingsAsync(new Settings
{
    TypoTolerance = new TypoTolerance
    {
        DisableOnAttributes = ["serialNumber"]
    }
});
await WaitForTaskAsync(client, typoSettingsTask.TaskUid);

// 4. Add some dummy products
Console.WriteLine("Inserting dummy products...");
var products = new[]
{
    new Product { Id = Guid.NewGuid(), Name = "Widget Alpha", SerialNumber = "SN12345" },
    new Product { Id = Guid.NewGuid(), Name = "Widget Beta", SerialNumber = "SN12346" },
    new Product { Id = Guid.NewGuid(), Name = "Widget Gamma", SerialNumber = "SN12347" }
};

var addTask = await client.Index("products").AddDocumentsAsync(products);
await WaitForTaskAsync(client, addTask.TaskUid);

Console.WriteLine("All tasks completed successfully.");

static async Task WaitForTaskAsync(MeilisearchClient client, int taskUid)
{
    var policy = Policy
        .HandleResult<TaskResource>(t => t.Status != TaskInfoStatus.Succeeded)
        .WaitAndRetryAsync(
            retryCount: 5,
            sleepDurationProvider: retryCount => TimeSpan.FromMilliseconds(500 * Math.Pow(2, retryCount)),
            onRetry: (result, ts) => { Console.WriteLine("Retrying action..."); });

    await policy.ExecuteAsync(async () => await client.GetTaskAsync(taskUid));
}

public record Product
{
    [JsonPropertyName("id")] public Guid Id { get; init; }
    [JsonPropertyName("name")] public string Name { get; init; } = "";
    [JsonPropertyName("serialNumber")] public string SerialNumber { get; init; } = "";
}

Expected behavior

When an exact match string value is provided to the query, the matching document is returned.

Actual behavior

Verify serial number values:

Search for SN12345:

All other products fail to be retrieved by exact serial number matching.

[cklogs]

@curquiza I could repro this issue hitting the meilisearch instance directly.

It's most probably not a bug on this client.

I've opened an issue on the main repo: meilisearch/meilisearch#5836

Feel free to link or close this ticket as needed.