OZG-3294 remove unused function

Jenkinsfile

@@ -844,10 +844,6 @@ Boolean isMasterBranch() {
     return env.BRANCH_NAME == 'master'
 }
 
-String getElasticsearchPassword(String bezeichner) {
-
-}
-
 String decodeString(String encoded) {
     return sh (script: "echo -n ${encoded} | base64 --decode", returnStdout: true)
 }