Elasticsearch with the .NET client

Uses Elastic.Clients.Elasticsearch 9.5 on .NET 10. The code is an ordinary application for the original database; nothing in it knows about MachNoSQL.

The only change

https://es.example.com:9200
https://machnosql.example.com:9200

The address comes from the environment variable ELASTICSEARCH_URL, so switching to MachNoSQL changes configuration only.

Run

export ELASTICSEARCH_URL='https://machnosql.example.com:9200'
dotnet run

Credentials come from ELASTICSEARCH_USERNAME and ELASTICSEARCH_PASSWORD.

Source

The program as it is kept and tested in the Mach Database NoSQL repository; highlighted lines read the connection setting.

Program.cs

// Product search on Elasticsearch, unchanged on MachNoSQL.
using Elastic.Clients.Elasticsearch;
using Elastic.Transport;

var settings = new ElasticsearchClientSettings(new Uri(Environment.GetEnvironmentVariable("ELASTICSEARCH_URL")!))
    .Authentication(new BasicAuthentication(
        Environment.GetEnvironmentVariable("ELASTICSEARCH_USERNAME")!,
        Environment.GetEnvironmentVariable("ELASTICSEARCH_PASSWORD")!))
    .DefaultIndex("products");
var client = new ElasticsearchClient(settings);

var products = new[]
{
    new Product("1", "mechanical keyboard", "keyco", 89.0),
    new Product("2", "wireless keyboard", "typer", 49.0),
    new Product("3", "gaming mouse", "keyco", 39.0),
};
await client.IndexManyAsync(products);
await client.Indices.RefreshAsync("products");

var found = await client.SearchAsync<Product>(s => s
    .Query(q => q.Match(m => m.Field(p => p.Name).Query("keyboard"))));
foreach (var hit in found.Hits)
{
    Console.WriteLine($"{hit.Score} {hit.Source?.Name}");
}

public sealed record Product(string Id, string Name, string Brand, double Price);

Example.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net10.0</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Elastic.Clients.Elasticsearch" Version="9.5.3" />
  </ItemGroup>
</Project>