Adding upgrade test for ElasticSearch (#705)

* Adding upgrade test for ElasticSearch

Author: amitr17

Jenkinsfile

@@ -4,4 +4,13 @@ common {
   upstreamProjects = 'confluentinc/common'
   pintMerge = true
   downStreamValidate = false
+  nodeLabel = 'docker-debian-jdk8'
 }
+
+def upgradeConnectorTest(body) {
+    build job: "confluentinc/connect-comprehensive-test-framework/master/", parameters: [
+                        string(name: 'PLUGIN_NAME', value: 'kafka-connect-elasticsearch'),
+                        string(name: 'BRANCH_TO_TEST', value: env.CHANGE_BRANCH)
+                    ], wait: true
+}
+upgradeConnectorTest{}