ElasticSearch 2.0 Transport Client - No Node Available exception

Question

[Using ElasticSearch version 2.0]

In etc/hosts file \"esnode\" is mapped to IP address(some other machine where ES is running) as shown

192.168.2.219 esnode

Answer 1

Other reason could be, your Elasticsearch Java client is a different version from your Elasticsearch server.

Elasticsearch Java client version is nothing but your elasticsearch jar version in your code base.

For example: In my code it's elasticsearch-2.4.0.jar

To verify Elasticsearch server version,

$ /Users/kkolipaka/elasticsearch/bin/elasticsearch -version Version: 5.2.2, Build: f9d9b74/2017-02-24T17:26:45.835Z, JVM: 1.8.0_111

As you can see, I've downloaded latest version of Elastic server 5.2.2 but forgot to update the ES Java API client version 2.4.0 https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/client.html