How to query Elasticsearch from C# via HTTP?

Question

I am trying to write code in C# for PUT and GET to my elasticsearch data. I typed code for PUT like this, and it seems that it works:

string url = "http://localhost:9200/my_index/my_type/";

JsonDocFormat json = new JsonDocFormat()
{
   name = "John"
};

string s = JsonConvert.SerializeObject(json);

using (var client = new WebClient())
{
   client.UploadString(url, "POST", s);
}

But I can't write code for this GET:

GET my_index/my_type/_search
{
   "query" : {
       "match" : {
            "name" : "john"
        }
    }
}

I tried something like this:

string url_req = "http://localhost:9200/my_index/my_type/_search?pretty";

string s1 = "{\"query\": {\"match\": { \"name\" : \"john\" }}}";

string s_req = url_req + s1;

using (var client = new WebClient())
{
    Console.Write(client.DownloadString(s_req));
}

But this code returned same output as for this GET:

GET /my_index/my_type/_search

It did not throw any error, but it absolutely ignored json body at the end of URL. I want to write this without any external package (as NEST or Elasticsearch.NET), just with HTTP.

Thanks in advance for any help!

shouldn't string s1 be "{\"query\": {\"match\": { \"name\" : \"john\" }}}" ? — ChintanShah25
– ChintanShah25, Commented Oct 28, 2015 at 20:15
Sorry just a mistake.. I tried to make it easier to understand. In my original document I use field ´text´ but here I renamed it to ´name´ but I forgot to overwrite that particular ´text´ in that piece of code. But my problem is still current. — Gondil
– Gondil, Commented Oct 28, 2015 at 21:17
Is it possible to explain what does 'pretty' refers to in your url request ? — Emna Jaoua
– Emna Jaoua, Commented Jul 30, 2019 at 8:51
@EmnaJaoua elastic.co/guide/en/elasticsearch/reference/current/… — Gondil
– Gondil, Commented Jul 30, 2019 at 9:10
Thanks for your reply. I am trying to do the same also using HttpClient library (since I need to work with .Net Client 2.2 framework). I am defining the url and credentials through client.BaseAddress and client.DefaultRequestHeaders.Authorization but when I get the response through response = await client.GetAsync(path), the response is not successful so I was not able to make a request. I am using exactly the same query format as yours (string s). Any useful links for help please ? — Emna Jaoua
– Emna Jaoua, Commented Jul 30, 2019 at 9:33

Gondil · Accepted Answer · 2015-10-30 20:05:41Z

2

Final solution for my question is in this code

string url_req = "http://localhost:9200/my_index/my_type/_search?pretty";

string s = "{\"query\": {\"match\": { \"name\" : \"john\" }}}";

using (var client = new WebClient())
{
    Console.Write(client.UploadString(url_req, "POST", s));
}

answered Oct 30, 2015 at 20:05

Gondil

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1 Comment

Shawn Eary Over a year ago

Your answer used a POST verb. For security reasons, I want to find a solution with the GET verb. GNU/Linux cURL will allow you to send message bodies with the GET verb so I don't understand why so many other WebRequest tools don't allow it. From what I've read elsewhere on SO, sending a request body with a GET request is "weird", but the standard doesn't specifically disallow it.

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