have new relic trace flex methods

config/initializers/flex_metrics.rb

@@ -0,0 +1,14 @@
+Flex.class_eval do
+  class << self
+    include ::NewRelic::Agent::MethodTracer
+    
+    verbs = %w(bulk count create_index delete_by_query delete_index
+               delete_mapping exist get get_mapping get_settings indices_exists
+               multi_get post_index post_store put_index put_mapping put_store
+               remove stats store)
+    
+    verbs.each do |method|
+      add_method_tracer(method)
+    end
+  end
+end