change a .setMasterNodeTimeout to .setClusterManagerNodeTimeout

Signed-off-by: Tianli Feng <ftianli@amazon.com>

server/src/internalClusterTest/java/org/opensearch/action/admin/indices/exists/IndicesExistsIT.java

@@ -53,7 +53,7 @@ public void testIndexExistsWithBlocksInPlace() throws IOException {
         String node = internalCluster().startNode(settings);
 
         assertRequestBuilderThrows(
-            client(node).admin().indices().prepareExists("test").setMasterNodeTimeout(TimeValue.timeValueSeconds(0)),
+            client(node).admin().indices().prepareExists("test").setClusterManagerNodeTimeout(TimeValue.timeValueSeconds(0)),
             ClusterManagerNotDiscoveredException.class
         );