Highlighting.cs

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

namespace ConsoleApplication15
{
    class Program
    {
        static void Main()
        {
            var connection = new ElasticConnection("localhost", 9200);
            var serializer = new JsonNetSerializer();


            // Add a sample document to index.
            var note = new Note {Caption = "Test Note", Text = "Note to test highlighting"};
            string noteJson = serializer.ToJson(note);
            connection.Put(Commands.Index("notes", "note", "1"), noteJson);

            // Create query with highlighting.
            string query = new QueryBuilder<Note>()
                .Query(q => q
                    .QueryString(qs => qs
                        .Fields(c => c.Caption)
                        .Query("Note")
                    )
                 )
                 .Highlight(h => h
                    .PreTags("<b>")
                    .PostTags("</b>")
                    .Fields(
                        f => f.FieldName(n => n.Caption).Order(HighlightOrder.score),
                        f => f.FieldName(n => n.Text)
                    )
                 )
                .BuildBeautified();

            Console.WriteLine("QUERY: \r\n" + query);

            // Execute query and deserialize results.
            string results = connection.Post(Commands.Search("notes", "note"), query);
            var noteResults = serializer.ToSearchResult<Note>(results);


            // Print first highlighted fragment for each hit.
            Console.WriteLine("\r\nHIGHLIGHTED FRAGMENTS: \r\n");
            foreach (var hit in noteResults.hits.hits)
            {
                foreach (var field in hit.highlight)
                {
                    string fieldName = field.Key;
                    string[] fragments = field.Value;
                    Console.WriteLine(fieldName + ":  " + fragments.FirstOrDefault());
                }
            }

            Console.ReadKey();
        }
    }


    public class Note
    {
        public string Caption { get; set; }
        public string Text { get; set; }
    }

}