remove access to patching elasticsearch client directly as it is not …

…supported anymore by elasticsearch (#3399)

* remove access to patching elasticsearch client directly as it is not supported anymore by elasticsearch
---------

Co-authored-by: Tony Hsu <tony.hsu@datadoghq.com>

lib/datadog/tracing/contrib/elasticsearch/patcher.rb

@@ -24,6 +24,7 @@ def patch
             require 'json'
             require_relative 'quantize'
 
+            transport_module::Client.prepend(DatadogPin)
             transport_module::Client.prepend(Client)
           end
 
@@ -34,26 +35,8 @@ module Client
             # rubocop:disable Metrics/MethodLength
             # rubocop:disable Metrics/AbcSize
             def perform_request(*args)
-              # DEV-2.0: Remove this access, as `Client#self` in this context is not exposed to the user
-              # since `elasticsearch` v8.0.0. In contrast, `Client#transport` is always available across
-              # all `elasticsearch` gem versions and should be used instead.
-              service = Datadog.configuration_for(self, :service_name)
-
-              if service
-                SELF_DEPRECATION_ONLY_ONCE.run do
-                  Datadog.logger.warn(
-                    'Providing configuration though the Elasticsearch client object is deprecated.' \
-                    'Configure the `client#transport` object instead: ' \
-                    'Datadog.configure_onto(client.transport, service_name: service_name, ...)'
-                  )
-                end
-              end
-
-              # `Client#transport` is most convenient object both this integration and the library
-              # user have shared access to across all `elasticsearch` versions.
-              #
-              # `Client#self` in this context is an internal object that the library user
-              # does not have access to since `elasticsearch` v8.0.0.
+              # `Client#transport` is the most convenient object both for this integration and the library
+              # as users have shared access to it across all `elasticsearch` versions.
               service ||= Datadog.configuration_for(transport, :service_name) || datadog_configuration[:service_name]
 
               method = args[0]
@@ -144,6 +127,25 @@ def datadog_configuration
           # rubocop:enable Metrics/MethodLength
           # rubocop:enable Metrics/AbcSize
 
+          # Patch to support both `elasticsearch` and `elastic-transport` versions
+          module DatadogPin
+            def datadog_pin=(pin)
+              pin.onto(pin_candidate)
+            end
+
+            def datadog_pin
+              Datadog.configuration_for(pin_candidate)
+            end
+
+            def pin_candidate(candidate = self)
+              if candidate.respond_to?(:transport)
+                pin_candidate(candidate.transport)
+              else
+                candidate
+              end
+            end
+          end
+
           # `Elasticsearch` namespace renamed to `Elastic` in version 8.0.0 of the transport gem:
           # @see https://github.com/elastic/elastic-transport-ruby/commit/ef804cbbd284f2a82d825221f87124f8b5ff823c
           def transport_module

spec/datadog/tracing/contrib/elasticsearch/transport_spec.rb

@@ -175,12 +175,12 @@ def call(env)
     end
   end
 
-  describe 'client configuration override' do
+  describe 'transport configuration override' do
     context 'when #service is overridden' do
-      before { Datadog.configure_onto(client.transport, service_name: service_name) }
-
       let(:service_name) { 'bar' }
 
+      before { Datadog.configure_onto(client.transport, service_name: service_name) }
+
       describe 'then a GET request' do
         subject(:response) { client.perform_request(method, path) }
 
@@ -198,25 +198,6 @@ def call(env)
           expect(span.name).to eq('elasticsearch.query')
           expect(span.service).to eq(service_name)
         end
-
-        context 'configured at the Elasticsearch client level' do
-          before do
-            skip('Configuration through client object is not possible in Elasticsearch >= 8.0.0') if version_greater_than_8
-
-            Datadog::Tracing::Contrib::Elasticsearch::Patcher::SELF_DEPRECATION_ONLY_ONCE
-              .send(:reset_ran_once_state_for_tests)
-
-            Datadog.configure_onto(client, service_name: 'custom')
-          end
-
-          let(:version_greater_than_8) { Gem::Version.new(::Elasticsearch::VERSION) >= Gem::Version.new('8.0.0') }
-
-          it 'warns about deprecated configuration of the Elasticsearch client itself' do
-            expect { response }.to emit_deprecation_warning(
-              include('Providing configuration though the Elasticsearch client object is deprecated')
-            )
-          end
-        end
       end
     end
   end