ElasticSearch Nest Cross-Cluster Search C#

Question

I need to perform a cross-cluster search using Nest but I'm not being able to find a way.

Uri elasticNode = new Uri(elasticSearchUri); ConnectionSettings nodeSettings = new ConnectionSettings(elasticNode).DefaultIndex(elasticIndexName); ElasticClient elasticClient = new ElasticClient(nodeSettings);

Find no documentation about it as well.

Any help would be appreciated.

Answer 1

To search across clusters, first need to have at least one remote cluster configured

var pool = new SingleNodeConnectionPool(new Uri("http://example.com:9200"));
var settings = new ConnectionSettings(pool);
var client = new ElasticClient(settings);

var putSettingsResponse = client.Cluster.PutSettings(s => s
    .Persistent(d => d
        .Add("cluster.remote.cluster_two.seeds", new[] { "127.0.0.1:9300" })
        .Add("cluster.remote.cluster_two.skip_unavailable", true)
    )
);

This configures a cluster named cluster_two at 127.0.0.1:9300 (use the transport layer port).

Now, to search across both the cluster configured with the client and the remote cluster

var searchResponse = client.Search<MyDocument>(s => s
    .Index("index_name,cluster_two:index_name")
    .Query(q => q
        .MatchAll()
    )
);

which searches across the index named "index_name" in the cluster at http://example.com:9200 and the index named "index_name" in remote cluster at 127.0.0.1