Adding missing javadocs

Signed-off-by: Ankit Jain <[email protected]>

server/src/main/java/org/opensearch/search/ResourceType.java

@@ -16,6 +16,9 @@
 import java.io.IOException;
 import java.util.function.Function;
 
+/**
+ * Enum to hold the resource type
+ */
 @PublicApi(since = "2.x")
 public enum ResourceType {
     CPU("cpu", task -> task.getTotalResourceUtilization(ResourceStats.CPU)),
@@ -51,6 +54,12 @@ public String getName() {
         return name;
     }
 
+    /**
+     * Gets the resource usage for a given resource type and task.
+     *
+     * @param task the task for which to calculate resource usage
+     * @return the resource usage
+     */
     public long getResourceUsage(Task task) {
         return getResourceUsage.apply(task);
     }