Limit ElasticSearch RAM to 1 GB

Committing straight to master since this file
is not used by @bridgetkromhout, and people use
that file by cloning the repo (so it has to be
merged in master for people to see it).

HASHTAG YOLO

k8s/efk.yaml

@@ -132,6 +132,9 @@ spec:
         resources: {}
         terminationMessagePath: /dev/termination-log
         terminationMessagePolicy: File
+        env:
+        - name: ES_JAVA_OPTS
+          value: "-Xms1g -Xmx1g"
       dnsPolicy: ClusterFirst
       restartPolicy: Always
       schedulerName: default-scheduler