Default concurrent_shards_per_node in ES|QL from 10 to 5

Author: dnhatn

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/plugin/QueryPragmas.java

@@ -55,7 +55,7 @@ public final class QueryPragmas implements Writeable {
      */
     public static final Setting<TimeValue> STATUS_INTERVAL = Setting.timeSetting("status_interval", Driver.DEFAULT_STATUS_INTERVAL);
 
-    public static final Setting<Integer> MAX_CONCURRENT_SHARDS_PER_NODE = Setting.intSetting("max_concurrent_shards_per_node", 10, 1, 100);
+    public static final Setting<Integer> MAX_CONCURRENT_SHARDS_PER_NODE = Setting.intSetting("max_concurrent_shards_per_node", 5, 1, 100);
 
     public static final Setting<Boolean> NODE_LEVEL_REDUCTION = Setting.boolSetting("node_level_reduction", true);