[ELITE-7005] Limit new filter only to one type of log;

Author: alexanderilyin

fluent.conf

@@ -48,7 +48,7 @@
   tag php.app-access
 </source>
 
-<filter php.*>
+<filter php.error>
   @type map
   time time
   # TODO install ruby to use `record["msg"].strip` & `record["severity"].upcase`.