Merge pull request #4014 from edx/up-heap-size-neo4j

increase heap and page cache sizes for neo4j

CHANGELOG.md

 - Role: neo4j
+  - Increase heap and page caches sizes for neo4j
+
+- Role: neo4j
   - Updated neo4j to 3.2.2
   - Removed authentication requirement for neo4j
 

playbooks/roles/neo4j/defaults/main.yml

@@ -27,8 +27,8 @@ neo4j_server_config_file: "/etc/neo4j/neo4j.conf"
 neo4j_https_port: 7473  # default in package is 7473
 neo4j_http_port: 7474  # default in package is 7474
 neo4j_listen_address: "0.0.0.0"
-neo4j_heap_max_size: "3000m"
-neo4j_page_cache_size: "3000m"
+neo4j_heap_max_size: "6000m"
+neo4j_page_cache_size: "6000m"
 neo4j_log_dir: "/var/log/neo4j"
 
 # Properties file settings