allow_partial_result in search_shards

Author: dnhatn

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

@@ -328,7 +328,7 @@ void searchShards(
             filter,
             null,
             null,
-            false,
+            true,
             clusterAlias
         );
         transportService.sendChildRequest(