Fixes checking for endpoint opts in ES perform_request

Author: picandocodigo

elasticsearch/lib/elasticsearch.rb

@@ -63,7 +63,7 @@ def method_missing(name, *args, &block)
         # The last arg is opts, which shouldn't be sent when `perform_request` is called
         # directly. Check if :endpoint is a key, which means it's the extra identifier
         # used for OpenTelemetry.
-        args.pop if args[-1][:endpoint]
+        args.pop if args[-1].is_a?(Hash) && args[-1][:endpoint]
         if (opaque_id = args[2]&.delete(:opaque_id))
           headers = args[4] || {}
           opaque_id = @opaque_id_prefix ? "#{@opaque_id_prefix}#{opaque_id}" : opaque_id