core: changed the flush event priority

This change was required to ensure that flush results are processed and
any resources tied to those coroutines are released before we schedule
new flushes.

Signed-off-by: Leonardo Alminana <[email protected]>

Author: Leonardo Alminana

include/fluent-bit/flb_engine_macros.h

@@ -66,7 +66,7 @@
 #define FLB_ENGINE_PRIORITY_CB_SCHED    FLB_ENGINE_PRIORITY_TOP
 #define FLB_ENGINE_PRIORITY_CB_TIMER    FLB_ENGINE_PRIORITY_TOP
 #define FLB_ENGINE_PRIORITY_SHUTDOWN    FLB_ENGINE_PRIORITY_TOP
-#define FLB_ENGINE_PRIORITY_FLUSH       FLB_ENGINE_PRIORITY_TOP
+#define FLB_ENGINE_PRIORITY_FLUSH       (FLB_ENGINE_PRIORITY_NETWORK + 1)
 
 #define FLB_ENGINE_PRIORITY_DNS         FLB_ENGINE_PRIORITY_NETWORK
 #define FLB_ENGINE_PRIORITY_CONNECT     FLB_ENGINE_PRIORITY_NETWORK