Fix test

Author: ldematte

qa/packaging/src/test/java/org/elasticsearch/packaging/test/ArchiveTests.java

@@ -571,9 +571,7 @@ public void test92ElasticsearchNodeCliPackaging() throws Exception {
     }
 
     public void test93ElasticsearchNodeCustomDataPathAndNotEsHomeWorkDir() throws Exception {
-        Path relativeDataPath = installation.data.relativize(installation.home);
-        logger.info("installation.data: {}, installation.home {}, relativeDataPath {}",
-            installation.data, installation.home, relativeDataPath);
+        Path relativeDataPath = getRootTempDir().resolve("custom_data");
         append(installation.config("elasticsearch.yml"), "path.data: " + relativeDataPath);
         sh.setWorkingDirectory(getRootTempDir());