use error log

Signed-off-by: Abhishek Choudhary <shreemaan.abhishek@gmail.com>

Author: shreemaan-abhishek

apisix/plugin.lua

@@ -1276,7 +1276,7 @@ local function merge_global_rules(global_rules, conf_version)
         if global_rule.value and global_rule.value.plugins then
             for plugin_name, plugin_conf in pairs(global_rule.value.plugins) do
                 if seen_plugin[plugin_name] then
-                    core.log.warn("Found ", plugin_name,
+                    core.log.error("Found ", plugin_name,
                                   " configured across different global rules.",
                                   " Removing it from execution list")
                     plugins_hash[plugin_name] = nil