add missing javaDocStrings

libs/offline-tasks/src/main/java/org/opensearch/offline_tasks/TaskClient.java

@@ -25,66 +25,66 @@ public interface TaskClient {
     /**
      * Submit a new task to TaskStore/Queue
      *
-     * @param task
+     * @param task Task to be submitted for execution on offline nodes
      */
     void submitTask(Task task);
 
     /**
      * Claim task from TaskStore/Queue. This ensures no 2 Offline Nodes work on the same task.
      *
-     * @param taskId
+     * @param taskId TaskId of the task to be claimed
      */
     void claimTask(TaskId taskId);
 
     /**
      * Get task from TaskStore/Queue
      *
-     * @param taskId
+     * @param taskId TaskId of the task to be retrieved
      * @return Task corresponding to TaskId
      */
     Task getTask(TaskId taskId);
 
     /**
      * Update task in TaskStore/Queue
      *
-     * @param task
+     * @param task Task to be updated
      */
     void updateTask(Task task);
 
     /**
      * Mark task as cancelled.
      * Ongoing Tasks can be cancelled as well if the corresponding worker supports cancellation
      *
-     * @param taskId
+     * @param taskId TaskId of the task to be cancelled
      */
     void cancelTask(TaskId taskId);
 
     /**
      * List all unassigned tasks
      *
-     * @return
+     * @return list of all the task which are note not assigned to any worker
      */
     List<Task> getUnassignedTasks();
 
     /**
      * List all active tasks
      *
-     * @return
+     * @return list of all the task which are running on any worker
      */
     List<Task> getActiveTasks();
 
     /**
      * List all completed tasks
      *
-     * @return
+     * @return list of all the task which have completed execution
      */
     List<Task> getCompletedTasks();
 
     /**
      * Sends task heart beat to Task Store/Queue
      *
-     * @param taskId
-     * @param timestamp
+     * @param taskId TaskId of Task to send heartbeat for
+     * @param timestamp timestamp of heartbeat to be recorded in TaskStore/Queue
      */
     void sendTaskHeartbeat(TaskId taskId, long timestamp);
 }

libs/offline-tasks/src/main/java/org/opensearch/offline_tasks/task/TaskId.java

@@ -23,7 +23,7 @@ public class TaskId {
 
     /**
      * Constructor to initialize TaskId
-     * @param id
+     * @param id String value of Task id
      */
     public TaskId(String id) {
         this.id = id;