Update default image value in elasticsearch

This change updates the default image value in the elasticsearch
chart from newton to wallaby for the one image that utilizes a
heat image.

Change-Id: Ia94cfb62a6602dcaf465c2c314ee75d24cff4286

elasticsearch/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v7.6.2
 description: OpenStack-Helm ElasticSearch
 name: elasticsearch
-version: 0.2.17
+version: 0.2.18
 home: https://www.elastic.co/
 sources:
   - https://github.com/elastic/elasticsearch

elasticsearch/values.yaml

@@ -18,7 +18,7 @@
 images:
   tags:
     apache_proxy: docker.io/library/httpd:2.4
-    memory_init: docker.io/openstackhelm/heat:newton-ubuntu_xenial
+    memory_init: docker.io/openstackhelm/heat:wallaby-ubuntu_focal
     elasticsearch: docker.io/openstackhelm/elasticsearch-s3:latest-7_6_2
     curator: docker.io/bobrik/curator:5.8.1
     ceph_key_placement: docker.io/openstackhelm/ceph-config-helper:ubuntu_bionic-20191216

releasenotes/notes/elasticsearch.yaml

@@ -27,4 +27,5 @@ elasticsearch:
   - 0.2.15 Fix elasticsearch-data shutdown
   - 0.2.16 Use python3 for helm tests when possible
   - 0.2.17 Annotate ES master/data sts with S3 secret hash
+  - 0.2.18 Update default image value to Wallaby
 ...