Getting Empty Results using NEST for ElasticSearch

Question

I ma making my first steps using ElasticSearch and NEST C# library for .NET. Here is my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Nest;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

        var setting = new ConnectionSettings(new Uri("http://localhost:9200/"));
        setting.SetDefaultIndex("Post");
        var client = new ElasticClient(setting);

        var post = new Post();
        post.id = 1;
        post.title = "the title";

        var t = client.Index(post);

        var results = client.Search<Post>(s => s.From(0)
            .Size(10)
            .Fields(f => f.id, f => f.title)
            .Query(q => q.Term(f => f.title, "title", Boost: 2.0))
            );

    }
}
public class Post
{
    public int id { get; set; }
    public string title { get; set; }
}

I was expecting to get the result from Post 1 because it has "title" keyword in it, but I get empty result set. What I am doing wrong?

Already answered in: stackoverflow.com/questions/15887276/… — Liron Harel
– Liron Harel, Commented Aug 15, 2013 at 10:36

ramseykhalaf · Accepted Answer · 2013-08-15 14:04:10Z

3

The issue is the term query being used. This will only match the exact text indexed. The term query is useful for id type searching.

If you are doing free text searching try using the match query for a good general purpose free text search. You can read more about it here on the official docs and hopefully start discovering how to build interesting and powerful queries by becoming familiar with the docs.

Good luck

answered Aug 15, 2013 at 14:04

ramseykhalaf

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Comments

Slyvain · Accepted Answer · 2013-08-15 10:24:29Z

0

It takes a very little time for the indexation of your Post. If you insert a Thread.Sleep(1000); between your indexation and your query, you'll have results.

answered Aug 15, 2013 at 10:24

Slyvain

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2 Comments

ramseykhalaf Over a year ago

While this is a good spot (and I certainly was confused by this at one point) I think it might be the type of query he is using.

Martijn Laarman Over a year ago

If you need to get results immediately after an Index() use Get() which is realtime or if you need to get it back from the Search() call Index() passing new IndexParameters { Refresh = true } but in the long run you gain more from designing the app to deal with the Near Real Time nature of elasticsearch. Never ever rely on a Thread.Sleep for a plethora of reasons.

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