diff --git a/modules/openstack_project/templates/logstash/indexer.conf.erb b/modules/openstack_project/templates/logstash/indexer.conf.erb
index 83fd5c31a6..82907219fc 100644
--- a/modules/openstack_project/templates/logstash/indexer.conf.erb
+++ b/modules/openstack_project/templates/logstash/indexer.conf.erb
@@ -78,5 +78,6 @@ output {
   elasticsearch {
     host => "elasticsearch.openstack.org"
     node_name => "logstash-indexer"
+    max_inflight_requests => 512
   }
 }