Thursday, June 12, 2014

Elasticsearch with .NET : NEST Library Code Example

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Elasticsearch can be used with a number of programming languages, one of it being Microsoft .NET. Elasticsearch.NET (low level client) and NEST (high level client). 

NEST comes with a strongly typed wrapper around Elasticsearch.NET API, and allows for a fully object oriented programming approach to interface with Elasticsearch. It also has nice documentation to learn the APIs. 

The first program that I would want to generally write, is to index a structured document into elasticsearch using C# code and NEST APIs. One only needs any version of Visual Studio and NEST Nugget package installed. Below is the very first console application I wrote to test the .NET integration with Elasticsearch. Let me know whether you liked the code, whether it worked for you, and in case if you need any help with programming.


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Nest;
using Nest.Domain.Connection;

namespace ESConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            var uri = new Uri("http://localhost:9200");
            var settings = new ConnectionSettings(uri).SetDefaultIndex("contacts");
            var client = new ElasticClient(settings);
            

            if (client.Health(HealthLevel.Cluster).ConnectionStatus.Success)
            {
                Console.WriteLine("Connection Successful");
                
                if (client.IndexExists("contacts").Exists)
                {
                    Console.WriteLine("Index Exists");
                    Program.UpsertArticle(client, new Article("The Last Airbender", "Siddharth"), "blog", "article", 1);
                    Program.UpsertContact(client, new Contacts("Siddharth Mehta", "India"), "contacts", "contacts", 2);
                    Console.WriteLine("Data Indexed Successfully");
                }
                else
                {
                    Console.WriteLine("Index Does Not Exist");
                }
                
            }
            else
            {
                Console.Write("Connection Failed");
            }

            Console.ReadKey();

        }

        public class Article
        {
            public string title { get; set; }
            public string artist { get; set; }
            public Article(string Title, string Artist)
            {
                title = Title; artist = Artist;
            }
        }

        public class Contacts
        {
            public string name { get; set; }
            public string country { get; set; }
            public Contacts(string Name, string Country)
            {
                name = Name; country = Country;
            }
        }

        public static void UpsertArticle(ElasticClient client, Article article, string index, string type, int id)
        {            
            var RecordInserted = client.Index(article, index, type, id).Id;
                        
            if (RecordInserted.ToString() != "")
            {
                Console.WriteLine("Transaction Successful !");
            }
            else
            {
                Console.WriteLine("Transaction Failed");
            }
        }

        public static void UpsertContact(ElasticClient client, Contacts contact, string index, string type, int id)
        {
            var RecordInserted = client.Index(contact, index, type, id).Id;

            if (RecordInserted.ToString() != "")
            {
                Console.WriteLine("Transaction Successful !");
            }
            else
            {
                Console.WriteLine("Transaction Failed");
            }
        }
    }
}

4 comments:

Anonymous said...

Thanks :)

Shawn Mullen said...

The documentation for NEST is so bad, it is basically easier to just use JSON and an http client. Is there any good documentation for NEST?

Rich Ward said...

Hi Siddharth -

This looks interesting. However, I can't get it compile. First, I cannot find Nest.Domain.Connection;

Also, I can't find the Health class in ElasticClient. Perhaps I'm missing something?

Any assistance would be greatly appreciated.

Many thanks,

- Rich

Ashish Jain said...

Thanks for posting dude :).

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