Speedup string interning in ClusterName (elastic#112045)

If we want to intern here, we should use the deduplicator to speed
things up.

Author: original-brownbear

server/src/main/java/org/elasticsearch/cluster/ClusterName.java

@@ -39,7 +39,8 @@ public ClusterName(StreamInput input) throws IOException {
     }
 
     public ClusterName(String value) {
-        this.value = value.intern();
+        // cluster name string is most likely part of a setting so we can speed things up over outright interning here
+        this.value = Settings.internKeyOrValue(value);
     }
 
     public String value() {

server/src/main/java/org/elasticsearch/common/settings/Settings.java

@@ -1567,7 +1567,7 @@ private static String toString(Object o) {
      * @param s string to intern
      * @return interned string
      */
-    static String internKeyOrValue(String s) {
+    public static String internKeyOrValue(String s) {
         return settingLiteralDeduplicator.deduplicate(s);
     }