RandomSortNew.cs

using System;
using System.Linq;
using PlainElastic.Net;
using PlainElastic.Net.Queries;
using PlainElastic.Net.Serialization;
using PlainElastic.Net.Utils;

namespace RandomSortSample
{
    internal class Tweet
    {
        public string Name { get; set; }

        public string Text { get; set; }
    }


    class Program
    {
        static void Main(string[] args)
        {
            var connection = new ElasticConnection("localhost");
            var serializer = new JsonNetSerializer();


            for (int i = 0; i < 10; i++)
            {
                var tweet = new Tweet
                {
                    Name = "User" + i,
                    Text = "some text from user" + i
                };

                connection.Put(Commands.Index("twitter", "tweet", i.AsString()).Refresh(),
                               serializer.Serialize(tweet));
            }

// use .FunctionScore query to genrater random score
            var query = new QueryBuilder<Tweet>()
                .Query(q => q
                    .FunctionScore(fs => fs
                        .Query(qfs => qfs.MatchAll())
                        .Function(f => f
                            .RandomScore(rs => rs
                                .Seed(1379333621000)
                            )
                        )
                    )
                )
                .Sort(srt => srt
                    .Field("_score", SortDirection.asc)
                 )
                .BuildBeautified();

            var result = connection.Post(Commands.Search("twitter", "tweet"), query);

            var randomlyOrderedTweets = serializer.ToSearchResult<Tweet>(result).Documents;

            Console.WriteLine(randomlyOrderedTweets.Select(t => t.Name + ": " + t.Text).JoinWithSeparator("\r\n"));

            Console.ReadKey();
        }
    }


}

RandomSortSample.cs

using System;
using System.Linq;
using PlainElastic.Net;
using PlainElastic.Net.Queries;
using PlainElastic.Net.Serialization;
using PlainElastic.Net.Utils;

namespace RandomSortSample
{
    internal class Tweet
    {
        public string Name { get; set; }

        public string Text { get; set; }
    }


    class Program
    {
        static void Main(string[] args)
        {
            var connection = new ElasticConnection("localhost");
            var serializer = new JsonNetSerializer();


            for (int i = 0; i < 10; i++)
            {
                var tweet = new Tweet
                {
                    Name = "User" + i,
                    Text = "some text from user" + i
                };

                connection.Put(Commands.Index("twitter", "tweet", i.AsString()).Refresh(),
                               serializer.Serialize(tweet));
            }


            var query = new QueryBuilder<Tweet>()
                .Query(q => q
                    .Custom(
@"{
    'function_score': {
        'query': { 'match_all': {}},
        'random_score': {
          'seed': 1379333621000
        }
     }
}".AltQuote()
                    )
                )
                .Sort( srt => srt
                    .Field("_score",SortDirection.asc)
                 )
                .BuildBeautified();

            var result = connection.Post(Commands.Search("twitter", "tweet"), query);

            var randomlyOrderedTweets = serializer.ToSearchResult<Tweet>(result).Documents;

            Console.WriteLine(randomlyOrderedTweets.Select(t => t.Name + ": " + t.Text).JoinWithSeparator("\r\n") );

            Console.ReadKey();
        }
    }


}