Fix incorrect variable name

CHANGELOG.md

@@ -7,6 +7,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Deprecated
 ### Removed
 ### Fixed
+- Fixed variable name in `OpenSearch::Client#respond_to_missing?` ([#247](https://github.com/opensearch-project/opensearch-ruby/pull/247))
 ### Security
 
 ## [3.2.0]

lib/opensearch.rb

@@ -49,7 +49,7 @@ def method_missing(name, *args, &block)
     end
 
     def respond_to_missing?(method_name, include_private = false)
-      name == :perform_request || super
+      method_name == :perform_request || super
     end
 
     private

lib/opensearch/dsl/search.rb

@@ -250,7 +250,7 @@ def method_missing(name, *args, &block)
         end
 
         def respond_to_missing?(method_name, include_private = false)
-          @options.respond_to?(name) || super
+          @options.respond_to?(method_name) || super
         end
 
         # Converts the search definition to a Hash

spec/opensearch/client/unit/opensearch_client_spec.rb

@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# The OpenSearch Contributors require contributions made to
+# this file be licensed under the Apache-2.0 license or a
+# compatible open source license.
+#
+# Modifications Copyright OpenSearch Contributors. See
+# GitHub history for details.
+
+require_relative '../../../spec_helper'
+
+describe 'OpenSearch::Client#respond_to_missing?' do
+  it 'returns to correct results' do
+    client = OpenSearch::Client.new
+    expect(client.send(:respond_to_missing?, :perform_request)).to be true
+    expect(client.send(:respond_to_missing?, :something_else)).to be false
+  end
+end