Elasticsearch NoNodeAvailableException 问题解决

NoNodeAvailableException[None of the configured nodes are available: []]

问题原因：

改过集群的名字，没有采用默认的名字（elasticsearch).

解决方法：

先来看没改过集群名字的情况：

Client client = TransportClient.builder().build();

client.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host1"), 9300));

改过集群名字的情况：

Settings settings = Settings.settingsBuilder()
.put("cluster.name", "myClusterName").build();
Client client = TransportClient.builder().settings(settings).build();
client.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host1"), 9300));