update(store): more reasonable timeout time

Author: JisoLya

hugegraph-store/hg-store-node/src/main/java/org/apache/hugegraph/store/node/AppConfig.java

@@ -278,9 +278,9 @@ public class QueryPushDownConfig {
         private int fetchBatchSize;
 
         /**
-         * the timeout of request fetch
+         * the timeout of request fetch (ms)
          */
-        @Value("${query.push-down.fetch_timeout:3600000}")
+        @Value("${query.push-down.fetch_timeout:30_000}")
         private long fetchTimeOut;
 
         /**