example: adjust buffer setting

Author: Watson1978

example/fluentd/fluent.conf

@@ -26,7 +26,7 @@
   <buffer []>
     @type memory
     flush_interval 5s
-    flush_thread_count 2
+    flush_thread_count 4
     chunk_limit_size 10m
   </buffer>
 
@@ -41,7 +41,7 @@
   <buffer []>
     @type memory
     flush_interval 5s
-    flush_thread_count 2
+    flush_thread_count 4
     chunk_limit_size 10m
   </buffer>
 
@@ -71,7 +71,7 @@
   <buffer>
     @type memory
     flush_interval 5s
-    flush_thread_count 2
+    flush_thread_count 4
     chunk_limit_size 10m
   </buffer>