Automapping document into elasticsearch is not working using NEST

Question

I have a simple Dummy document in C#. I am trying to index it into elasticsearch for the first time using NEST client. But automaping is not working.

My dummy document is:

class DummyRecord {
    public string RecordName;
    public int RecordId;
}

And the main program is:

class Program
{
    static void Main(string[] args)
    {
        var node = new Uri("http://localhost:9200");
        var settings = new ConnectionSettings(node).DefaultTypeName("_doc");
        var client = new ElasticClient(settings);

        var doc = new DummyRecord {
            RecordName = "SOmething",
            RecordId = 1
        };
            
        var creaeIndexRespone = client.CreateIndex("DummyIndex",c => c.Mappings(ms=> ms.Map<DummyRecord>(m => m.AutoMap())));
        Console.WriteLine(creaeIndexRespone);
            
        var response = client.Index(doc, idx => idx.Index("DummyIndex"));
        Console.WriteLine(response);
        Console.ReadKey();
    }
}

All I am getting is the following output:

Invalid NEST response built from a unsuccessful low level call on PUT: /DummyIndex

Invalid NEST response built from a unsuccessful low level call on POST: /DummyIndex/_doc

How to get this thing working. Is there anything I have to do while creating the settings more than this??

var settings = new ConnectionSettings(node).DefaultTypeName("_doc");

Why do you want to map your data? you just need to pass your model — osman Rahimi
– osman Rahimi, Commented Apr 30, 2019 at 6:06
Initially ElasticSearch doesn't contain a mapping . So if you try to index a document , ElasticSearch will refuse . — Aditya Nadig
– Aditya Nadig, Commented Apr 30, 2019 at 6:09
@AdityaNadig By default, Elasticsearch will allow you to index a document into a non-existent index, and will (a) create the index and (b) infer the mapping from the first document indexed. You can turn off both auto index creation and change inferred mapping, but both are enabled by default. Where defining an explicit mapping is useful is in search use cases and other cases where you know how you'll want to search documents — Russ Cam
– Russ Cam, Commented Apr 30, 2019 at 7:42

Russ Cam · Accepted Answer · 2019-04-30 06:16:50Z

3

Two things

Index name needs to be lowercase i.e. "DummyIndex" -> "dummyindex"
DummyRecord members need to be properties and not fields

You can check whether the response to any API call is valid, and take action if needed

var client = new ElasticClient();

var createIndexResponse = client.CreateIndex(defaultIndex, c => c
    .Mappings(m => m
        .Map<DummyRecord>(mm => mm
            .AutoMap()
        )
    )
);

if (!createIndexResponse.IsValid) {
    Console.WriteLine(createIndexResponse.DebugInformation);
}

answered Apr 30, 2019 at 6:16

Russ Cam

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Comments

osman Rahimi · Accepted Answer · 2019-04-30 06:27:22Z

1

Initiate Your final model and just pass that model to elastic to index it.

Based On Elastic's documentation, you can index your data like this.

    var person = new Person
{
    Id = 1,
    FirstName = "Martijn",
    LastName = "Laarman"
};

var indexResponse = client.IndexDocument(person);

Updated: Index() vs IndexDocument

IndexDocument() is used when you want to simply index a single document.

Index() If you nedd to set additional parameters , you can use this method.

Take a look at Elastic documentation

edited Apr 30, 2019 at 6:27

answered Apr 30, 2019 at 6:09

osman Rahimi

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4 Comments

Aditya Nadig Over a year ago

what is the difference between client.Index() and client.IndexDocument() ??

osman Rahimi Over a year ago

@AdityaNadig Updated

Aditya Nadig Over a year ago

Thank you very much osman . But , Initially creating the index and mapping is required . And there is no much difference between Index() and IndexDocument() relevant to this context .

osman Rahimi Over a year ago

@AdityaNadig Yeah, I was confused. You wan to create an index not index a document. I got it :)

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