chore(buffer_worker): change default `batch_time` to 0 and improve docs

apps/emqx_resource/i18n/emqx_resource_schema_i18n.conf

@@ -159,12 +159,12 @@ When disabled the messages are buffered in RAM only."""
 
   batch_time {
     desc {
-      en: """Maximum batch waiting interval."""
+      en: """Maximum waiting interval when accumulating a batch at a low message rates for more efficient resource usage."""
-      zh: """最大批量请求等待时间。"""
+      zh: """在较低消息率情况下尝试累积批量输出时的最大等待间隔，以提高资源的利用率。"""
     }
     label {
-      en: """Batch time"""
+      en: """Max Batch Wait Time"""
-      zh: """批量等待间隔"""
+      zh: """批量等待最大间隔"""
     }
   }
 

apps/emqx_resource/include/emqx_resource.hrl

@@ -97,8 +97,8 @@
 -define(DEFAULT_BATCH_SIZE, 1).
 
 %% milliseconds
--define(DEFAULT_BATCH_TIME, 20).
+-define(DEFAULT_BATCH_TIME, 0).
--define(DEFAULT_BATCH_TIME_RAW, <<"20ms">>).
+-define(DEFAULT_BATCH_TIME_RAW, <<"0ms">>).
 
 %% count
 -define(DEFAULT_INFLIGHT, 100).

lib-ee/emqx_ee_bridge/test/emqx_ee_bridge_redis_SUITE.erl

@@ -540,7 +540,9 @@ resource_configs() ->
             <<"query_mode">> => <<"sync">>,
             <<"worker_pool_size">> => <<"1">>,
             <<"batch_size">> => integer_to_binary(?BATCH_SIZE),
-            <<"start_timeout">> => <<"15s">>
+            <<"start_timeout">> => <<"15s">>,
+            <<"batch_time">> => <<"4s">>,
+            <<"request_timeout">> => <<"30s">>
         }
     }.