Sync prerequisites with Helm Charts (#4483)

### What problem does this PR solve?

Address #4391

### Type of change

- [x] Other (please describe):

helm/templates/elasticsearch.yaml

@@ -52,6 +52,12 @@ spec:
         volumeMounts:
           - mountPath: /usr/share/elasticsearch/data
             name: es-data
+      - name: sysctl
+        image: busybox
+        securityContext:
+          privileged: true
+          runAsUser: 0
+        command: ["sysctl", "-w", "vm.max_map_count=262144"]
       containers:
       - name: elasticsearch
         image: docker.elastic.co/elasticsearch/elasticsearch:{{ .Values.env.STACK_VERSION }}

helm/values.yaml

@@ -91,7 +91,8 @@ elasticsearch:
     strategy:
     resources:
       requests:
-        memory: 8Gi
+        cpu: "4"
+        memory: "16Gi"
   service:
     type: ClusterIP