zuul: remove ElasticSearch tempest experimental job

This is not useful anymore since we move ES to Panko.

Change-Id: Iead483ab2e5b94113cded48a4e44a6142ac99434

.zuul.yaml

@@ -18,17 +18,6 @@
       - openstack-infra/devstack-gate
       - openstack/ceilometer
 
-- job:
-    name: ceilometer-dsvm-tempest-plugin-es
-    parent: legacy-dsvm-base
-    run: playbooks/legacy/ceilometer-dsvm-tempest-plugin-es/run
-    post-run: playbooks/legacy/ceilometer-dsvm-tempest-plugin-es/post
-    timeout: 7800
-    required-projects:
-      - openstack-infra/devstack-gate
-      - openstack/ceilometer
-      - openstack/tempest
-
 - job:
     name: ceilometer-dsvm-tempest-plugin-mongodb
     parent: legacy-dsvm-base
@@ -160,6 +149,3 @@
               - ^setup.cfg$
         - telemetry-dsvm-integration-ceilometer
         - ceilometer-dsvm-tempest-plugin-mongodb-identity-v3-only
-    experimental:
-      jobs:
-        - ceilometer-dsvm-tempest-plugin-es