CODEWITHSUNDEEP
c#asp.net.netelasticsearchnest
ASN
ASN

Reputation: 1893

How to use elastic search index used in one application in another application

I have an application with index called zzz and I indexed few documents into the index. 

        string configvalue1 = ConfigurationManager.AppSettings["http://localhost:9200/"];
        var pool = new SingleNodeConnectionPool(new Uri(configvalue1));
        var defaultIndex = "zzz";

        **settings = new ConnectionSettings(pool)
         .DefaultIndex(defaultIndex)
         .MapDefaultTypeNames(m => m.Add(typeof(Class1), "type"))
         .PrettyJson()
         .DisableDirectStreaming();
        client = new ElasticClient(settings);**


        if (client.IndexExists(defaultIndex).Exists && ConfigurationManager.AppSettings["syncMode"] == "Full")
        {
            client.DeleteIndex(defaultIndex);
            client.CreateIndex(defaultIndex);
        }

        return client;

Now in an entire new application, i have to check if zzz is existing or not and just use it for some search operation. Do I still have to write everything that is in between ** in the above code or just connect to the pool and check for index?

Here is my take:

        configvalue1 = ConfigurationManager.AppSettings["http://localhost:9200/"];

        var pool = new SingleNodeConnectionPool(new Uri(configvalue1));
        settings = new ConnectionSettings(pool);
        client = new ElasticClient(settings);

        // to check if the index exists and return if exist
        if (client.IndexExists("zzz").Exists)
        {
            return client;
        }

Just adding to the above question:

I want to implement some condition like this before indexing:

Index doesnt exist && sync mode == full  --> Create index
Index exist && sync mode==full           --> Delete old index and create a new
Index doesnt exist && sync mode == new   --> Create index
Index exist && sync mode==new            --> Use the existing index

TIA

Upvotes: 0

Views: 144

Answers (1)

Russ Cam
Russ Cam

Reputation: 125538

You would need at a minimum

string configvalue1 = ConfigurationManager.AppSettings["http://localhost:9200/"];
var pool = new SingleNodeConnectionPool(new Uri(configvalue1));
var defaultIndex = "zzz";

var settings = new ConnectionSettings(pool)
 .DefaultIndex(defaultIndex);

var client = new ElasticClient(settings);

if (!client.IndexExists(defaultIndex).Exists && 
    ConfigurationManager.AppSettings["syncMode"] == "Full")
{
    // do something when the index is not there. Maybe create it?
}

If you're going to be using Class1 in this application and don't want to specify the type for it on all requests then add

.MapDefaultTypeNames(m => m.Add(typeof(Class1), "type"))

to connection settings.

With

.PrettyJson()

this is useful for development purposes but I would not recommend using in production as all requests and responses will be larger as the json will be indented.

Similarly, with 

.DisableDirectStreaming()

again, I would not recommend using this in production unless you have a need say to log all requests and responses from the application side; this setting causes all request and response bytes to be buffered in a MemoryStream so that they can be read outside of the client, for example, in OnRequestCompleted.

More details on the settings can be found in the documentation.

Upvotes: 1

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