Ensure there's a master node

Co-authored-by: Niels Bauman <[email protected]>

Author: prdoyle

server/src/internalClusterTest/java/org/elasticsearch/reservedstate/service/FileSettingsServiceIT.java

@@ -504,9 +504,8 @@ public void testSettingsAppliedOnMasterReElection() throws Exception {
     }
 
     public void testHealthIndicatorWithSingleNode() throws Exception {
-        internalCluster().setBootstrapMasterNodeIndex(0);
         logger.info("--> start the node");
-        String nodeName = internalCluster().startNode((dataNode()));
+        String nodeName = internalCluster().startNode();
         FileSettingsService masterFileSettingsService = internalCluster().getInstance(FileSettingsService.class, nodeName);
         assertBusy(() -> assertTrue(masterFileSettingsService.watching()));