Deprecation check for tribe node (#36240)

Adds a deprecation check for tribe node.

Author: gwbrown

x-pack/plugin/deprecation/src/main/java/org/elasticsearch/xpack/deprecation/DeprecationChecks.java

@@ -38,6 +38,7 @@ private DeprecationChecks() {
 
     static List<BiFunction<List<NodeInfo>, List<NodeStats>, DeprecationIssue>> NODE_SETTINGS_CHECKS =
         Collections.unmodifiableList(Arrays.asList(
+            NodeDeprecationChecks::tribeNodeCheck,
             NodeDeprecationChecks::azureRepositoryChanges,
             NodeDeprecationChecks::gcsRepositoryChanges,
             NodeDeprecationChecks::fileDiscoveryPluginRemoved

x-pack/plugin/deprecation/src/main/java/org/elasticsearch/xpack/deprecation/NodeDeprecationChecks.java

@@ -18,6 +18,21 @@
  */
 public class NodeDeprecationChecks {
 
+    static DeprecationIssue tribeNodeCheck(List<NodeInfo> nodeInfos, List<NodeStats> nodeStats) {
+        List<String> nodesFound = nodeInfos.stream()
+            .filter(nodeInfo -> nodeInfo.getSettings().getByPrefix("tribe.").isEmpty() == false)
+            .map(nodeInfo -> nodeInfo.getNode().getName())
+            .collect(Collectors.toList());
+        if (nodesFound.size() > 0) {
+            return new DeprecationIssue(DeprecationIssue.Level.CRITICAL,
+                "Tribe Node removed in favor of Cross Cluster Search",
+                "https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_70_cluster_changes.html" +
+                    "#_tribe_node_removed",
+                "nodes with tribe node settings: " + nodesFound);
+        }
+        return null;
+    }
+
     static DeprecationIssue azureRepositoryChanges(List<NodeInfo> nodeInfos, List<NodeStats> nodeStats) {
         List<String> nodesFound = nodeInfos.stream()
             .filter(nodeInfo ->

x-pack/plugin/deprecation/src/test/java/org/elasticsearch/xpack/deprecation/NodeDeprecationChecksTests.java

@@ -59,6 +59,16 @@ null, null, null, null, new FsInfo(0L, null, paths), null, null, null,
         assertEquals(singletonList(expected), issues);
     }
 
+    public void testTribeNodeCheck() {
+        String tribeSetting = "tribe." + randomAlphaOfLengthBetween(1, 20) + ".cluster.name";
+        DeprecationIssue expected = new DeprecationIssue(DeprecationIssue.Level.CRITICAL,
+            "Tribe Node removed in favor of Cross Cluster Search",
+            "https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_70_cluster_changes.html" +
+                "#_tribe_node_removed",
+            "nodes with tribe node settings: [node_check]");
+        assertSettingsAndIssue(tribeSetting, randomAlphaOfLength(5), expected);
+    }
+
     public void testAzurePluginCheck() {
         Version esVersion = VersionUtils.randomVersionBetween(random(), Version.V_6_0_0, Version.CURRENT);
         PluginInfo deprecatedPlugin = new PluginInfo(