Fixup Neo4j pod OOM by adjust DBMS config (#409)

* Update README for Neo4j DBMS configs issue

* Fix Neo4j OOM by adjust DBMS configs

amundsen-kube-helm/README.md

@@ -110,9 +110,9 @@ You may want to override the default memory usage for Neo4J. In particular, if y
 ```
 config:
   dbms:
-    heap_initial_size: 2Gi
-    heap_max_size: 2Gi
-    pagecache_size: 2Gi
+    heap_initial_size: 1G
+    heap_max_size: 2G
+    pagecache_size: 2G
 ```
 
 With this values file, you can then install Amundsen using Helm 2 with:

amundsen-kube-helm/templates/helm/values.yaml

@@ -289,11 +289,11 @@ neo4j:
     ##
     dbms:
       ## neo4j.config.dbms.heap_initial_size -- the initial java heap for neo4j
-      heap_initial_size: 23000m
+      heap_initial_size: 1G
       ## neo4j.config.dbms.heap_max_size -- the max java heap for neo4j
-      heap_max_size: 23000m
+      heap_max_size: 2G
       ## neo4j.config.dbms.pagecache_size -- the page cache size for neo4j
-      pagecache_size: 26600m
+      pagecache_size: 2G
 
   ##
   ## neo4j.persistence -- Neo4j persistence. Turn this on to keep your data between pod crashes, etc. This is also needed for backups.