private static final String NUMBER_OF_PENDING_TASKS = "number_of_pending_tasks";
    private static final String NUMBER_OF_IN_FLIGHT_FETCH = "number_of_in_flight_fetch";
    private static final String DELAYED_UNASSIGNED_SHARDS = "delayed_unassigned_shards";
    private static final String TASK_MAX_WAIT_TIME_IN_QUEUE_IN_MILLIS = "task_max_waiting_in_queue_millis";
    private static final String ACTIVE_SHARDS_PERCENT_AS_NUMBER = "active_shards_percent_as_number";

            engineObj.initializingShards = response.getInitializingShards();
            engineObj.unassignedShards = response.getUnassignedShards();
            engineObj.delayedUnassignedShards = response.getDelayedUnassignedShards();
            engineObj.numberOfPendingTasks = response.getNumberOfPendingTasks();
            engineObj.numberOfInFlightFetch = response.getNumberOfInFlightFetch();