Stops running Typhoeus tests in JRuby

There's an issue with current versions of Typhoeus and libcurl, triggering a segmentation fault. I
will update to rerun these tests once there's a fix.

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

@@ -266,7 +266,7 @@
       it 'uses Faraday with the adapter' do
         expect(adapter).to eq Faraday::Adapter::Typhoeus
       end
-    end
+    end unless jruby?
 
     context 'when the adapter is specified as a string key' do
       let(:adapter) do
@@ -1758,7 +1758,7 @@
             it 'preserves the other headers' do
               expect(client.transport.connections[0].connection.headers['User-Agent'])
             end
-          end
+          end unless jruby?
         end
       end
 

elasticsearch-transport/test/integration/transport_test.rb

@@ -24,7 +24,7 @@ class Elasticsearch::Transport::ClientIntegrationTest < Minitest::Test
       begin; Object.send(:remove_const, :Patron);   rescue NameError; end
     end
 
-    should "allow to customize the Faraday adapter" do
+    should "allow to customize the Faraday adapter to Typhoeus" do
       require 'typhoeus'
       require 'typhoeus/adapters/faraday'
 
@@ -34,6 +34,19 @@ class Elasticsearch::Transport::ClientIntegrationTest < Minitest::Test
           f.adapter  :typhoeus
         end
 
+      client = Elasticsearch::Transport::Client.new transport: transport
+      client.perform_request 'GET', ''
+    end unless jruby?
+
+    should "allow to customize the Faraday adapter to NetHttpPersistent" do
+      require 'net/http/persistent'
+
+      transport = Elasticsearch::Transport::Transport::HTTP::Faraday.new \
+                                                                       :hosts => [ { host: @host, port: @port } ] do |f|
+        f.response :logger
+        f.adapter  :net_http_persistent
+      end
+
       client = Elasticsearch::Transport::Client.new transport: transport
       client.perform_request 'GET', ''
     end