correct reference to values in yaml file (#3632)

diff --git a/deploy/kubernetes/helm/templates/bookie.yaml b/deploy/kubernetes/helm/templates/bookie.yaml
index d978516..dea6f69 100644
--- a/deploy/kubernetes/helm/templates/bookie.yaml
+++ b/deploy/kubernetes/helm/templates/bookie.yaml
@@ -42,9 +42,9 @@
   BK_indexDirectories: "/bookkeeper/data/ledgers" 
   BK_zkServers: {{ .Release.Name }}-zookeeper:{{ .Values.zookeeper.clientPort }}
   BK_autoRecoveryDaemonEnabled: "true"
-  BK_journalMaxBackups: {{ .Values.bookieJournalMaxBackups }}
-  BK_journalMaxSizeMB: {{ .Values.bookieJournalMaxSizeMB }}
-  BK_logSizeLimit: {{ .Values.bookieLogSizeLimit }}
+  BK_journalMaxBackups: "{{ .Values.bookieJournalMaxBackups }}"
+  BK_journalMaxSizeMB: "{{ .Values.bookieJournalMaxSizeMB }}"
+  BK_logSizeLimit: "{{ .Values.bookieLogSizeLimit }}"
   {{- if or (eq .Values.platform "gke") (eq .Values.platform "minikube") }}
   BK_useHostNameAsBookieID: "true"
   {{- end }}