- upgrade ftw. This new version sets TCP_NODELAY on all connections.

Because of this change, the elasticsearch_http output can send data at a
much faster rate (since we aren't waiting for a full segment before
publishing data)

Before this patch, locally I measured elasticsearch_http at 1500 eps;
After this patch, I measured elasticsearch_http at 8500 eps.

logstash.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency "i18n"               #(MIT license)
 
   # Web dependencies
-  gem.add_runtime_dependency "ftw", ["~> 0.0.35"] #(Apache 2.0 license)
+  gem.add_runtime_dependency "ftw", ["~> 0.0.36"] #(Apache 2.0 license)
   gem.add_runtime_dependency "haml"               #(MIT license)
   gem.add_runtime_dependency "rack"               #(MIT license)
   gem.add_runtime_dependency "sass"               #(MIT license)