Add master as the table header alias for cluster_manager for compatib…

…ility

Signed-off-by: Tianli Feng <[email protected]>

server/src/main/java/org/opensearch/rest/action/cat/RestNodesAction.java

@@ -193,7 +193,8 @@ protected Table getTableWithHeader(final RestRequest request) {
             "node.role",
             "alias:r,role,nodeRole;desc:m:master eligible node, d:data node, i:ingest node, -:coordinating node only"
         );
-        table.addCell("cluster_manager", "alias:m;desc:*:current cluster manager");
+        // TODO: Remove the header alias 'master', after removing MASTER_ROLE. It's added for compatibility when using parameter 'h=master'.
+        table.addCell("cluster_manager", "alias:m,master;desc:*:current cluster manager");
         table.addCell("name", "alias:n;desc:node name");
 
         table.addCell("completion.size", "alias:cs,completionSize;default:false;text-align:right;desc:size of completion");

test/framework/src/main/java/org/opensearch/test/rest/yaml/OpenSearchClientYamlSuiteTestCase.java

@@ -324,7 +324,7 @@ private static void validateSpec(ClientYamlSuiteRestSpec restSpec) {
     private Tuple<Version, Version> readVersionsFromCatNodes(RestClient restClient) throws IOException {
         // we simply go to the _cat/nodes API and parse all versions in the cluster
         final Request request = new Request("GET", "/_cat/nodes");
-        request.addParameter("h", "version,cluster_manager");
+        request.addParameter("h", "version,master");
         request.setOptions(getCatNodesVersionMasterRequestOptions());
         Response response = restClient.performRequest(request);
         ClientYamlTestResponse restTestResponse = new ClientYamlTestResponse(response);