diff --git a/roles/elasticsearch/templates/elasticsearch.j2 b/roles/elasticsearch/templates/elasticsearch.j2
index 6a303ae..9376b98 100644
--- a/roles/elasticsearch/templates/elasticsearch.j2
+++ b/roles/elasticsearch/templates/elasticsearch.j2
@@ -16,7 +16,7 @@ ES_PATH_CONF=/etc/elasticsearch
 #PID_DIR=/var/run/elasticsearch
 
 # Additional Java OPTS
-ES_JAVA_OPTS="-Xms1g -Xmx1g"
+ES_JAVA_OPTS="-Xms512m -Xmx512m"
 
 # Configure restart on package upgrade (true, every other setting will lead to not restarting)
 #RESTART_ON_UPGRADE=true
diff --git a/roles/elasticsearch/templates/elasticsearch.yml.j2 b/roles/elasticsearch/templates/elasticsearch.yml.j2
index 5cb3547..b923e58 100644
--- a/roles/elasticsearch/templates/elasticsearch.yml.j2
+++ b/roles/elasticsearch/templates/elasticsearch.yml.j2
@@ -1,4 +1,4 @@
-network.host: 0.0.0.0
+network.host: "[::]"
 discovery.type: single-node
 path.data: {{ elasticsearch_data_dir }}
 path.logs: /var/log/elasticsearch