handle IPv6 host (#614)

* add ipv6 support

* add ipv6 support

* add ipv6 support

add test

Author: seko0716

elasticsearch-transport/lib/elasticsearch/transport/client.rb

@@ -201,6 +201,10 @@ def __parse_host(host)
               :host => uri.host,
               :path => uri.path,
               :port => uri.port }
+          elsif host =~ /^\[[a-z0-9:]+\]:[0-9]+/
+            host, sep, port = host.rpartition(':')
+            {:host => host,
+             :port => port}
           else
             host, port = host.split(':')
             { :host => host,

elasticsearch-transport/spec/elasticsearch/transport/client_spec.rb

@@ -126,6 +126,19 @@
         expect(hosts[0][:port]).to be(9200)
       end
 
+      context 'when ipv6 is specified' do
+
+        let(:host) do
+          '[fd95:ff55:7fb8:f1e5:f816:3eff:feed:ce5b]:9200'
+        end
+
+        it 'extracts the host' do
+          expect(hosts[0][:host]).to eq('[fd95:ff55:7fb8:f1e5:f816:3eff:feed:ce5b]')
+          expect(hosts[0][:scheme]).to eq('http')
+          expect(hosts[0][:port]).to be(9200)
+        end
+      end
+
       context 'when a path is specified' do
 
         let(:host) do