[GEM] Refactors Gem and Transport relationship

Initial commit on extracting Elasticsearch specific code from elasticsearch-transport and into the
elasticsearch gem. We're now using transport for elastic-enterprise-search too.

Author: picandocodigo

elasticsearch-transport/lib/elasticsearch/transport.rb

@@ -35,15 +35,3 @@
 require "elasticsearch/transport/redacted"
 
 require "elasticsearch/transport/version"
-
-module Elasticsearch
-  module Client
-
-    # A convenience wrapper for {::Elasticsearch::Transport::Client#initialize}.
-    #
-    def new(arguments={}, &block)
-      Elasticsearch::Transport::Client.new(arguments, &block)
-    end
-    extend self
-  end
-end

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

@@ -176,7 +176,6 @@ def initialize(arguments = {}, &block)
                        end
         end
       end
-
       # Performs a request through delegation to {#transport}.
       #
       def perform_request(method, path, params = {}, body = nil, headers = nil)

elasticsearch/lib/elasticsearch.rb

@@ -20,12 +20,27 @@
 require 'elasticsearch/api'
 
 module Elasticsearch
-  module Transport
-    class Client
-      include Elasticsearch::API
+  class Client
+    include Elasticsearch::API
+
+    def initialize(arguments = {}, &block)
+      @transport = Elasticsearch::Transport::Client.new(arguments, &block)
+    end
+
+    def method_missing(name, *args, &block)
+      if methods.include?(name)
+        super
+      else
+        @transport.send(name, *args, &block)
+      end
+    end
+
+    def respond_to_missing?(method_name, *args)
+      @transport.respond_to?(method_name) || super
     end
   end
 end
+
 module Elastic
   # If the version is X.X.X.pre/alpha/beta, use X.X.Xp for the meta-header:
   def self.client_meta_version