lib/elasticsearch/transport/client.rb in elasticsearch-transport-7.16.0 vs lib/elasticsearch/transport/client.rb in elasticsearch-transport-7.16.1

@@ -206,13 +206,14 @@
         @arguments.delete(:password)
       end
 
       def set_compatibility_header
         return unless ['1', 'true'].include?(ENV['ELASTIC_CLIENT_APIVERSIONING'])
+        return if instance_variable_get('@options').dig(:transport_options, :headers, 'Accept')
 
         add_header(
           {
-            'Accept' => 'application/vnd.elasticsearch+json;compatible-with=7',
+            'Accept' => 'application/vnd.elasticsearch+json; compatible-with=7',
             'Content-Type' => 'application/vnd.elasticsearch+json; compatible-with=7'
           }
         )
       end