Minor improvement to index_exists? using correct es api call

lib/elasticsearch/client/admin_index.rb

@@ -5,13 +5,8 @@ module Index
         PSEUDO_INDICES = [:all]
 
         def index_exists?(index)
-          !!index_status(index)
-        rescue RequestError => e
-          if e.status == 404
-            false
-          else
-            raise e
-          end
+          response = execute(:index_exists, index)
+          response.status==200 ? true : false
         end
 
         def index_status(*args)

lib/elasticsearch/transport/base_protocol.rb

@@ -107,6 +107,11 @@ def multi_get(index, type, query, options={})
     end
 
     module IndexAdminProtocol
+
+      def index_exists(index)
+        request(:head, {:index => index})
+      end
+
       def index_status(index_list, options={})
         standard_request(:get, {:index => index_list, :op => "_status"})
       end