Update entities programmatically

To update an entity type programmatically, Please follow the following steps.

1. Check current entity status and make an image (Here get the ids list).
  Example :

$ids_old = \Drupal::entityQuery('entity_update_tests_cnt')->execute();

2. Update the correct entity type.
  Example :
 

$entity_type = \Drupal::entityTypeManager()->getStorage('entity_update_tests_cnt');
$result = EntityUpdate::safeUpdateMain($entity_type->getEntityType());

3. Check the new entity status and make an image.
  Example :

$ids_new = \Drupal::entityQuery('entity_update_tests_cnt')->execute();

4. Compare both status and determine update is success or failed.
  Example :

  if (!empty(array_diff($ids_old, $ids_new))) {
    // Your codes if update checking failed.
  }

Example

<?php

/**
 * @file
 * Entity update test module (entity_update_tests).
 *
 * This file provide install/uninstall/update tasks.
 */
use Drupal\Core\Utility\UpdateException;
use Drupal\entity_update\EntityUpdate;

/**
 * Update 01 - Example for update an entity type 'entity_update_tests_cnt'.
 */
function entity_update_tests_update_8001() {

  // Entity checking process : Get current entities list.
  $ids_old = \Drupal::entityQuery('entity_update_tests_cnt')->execute();

  // Get entity type.
  $entity_type = \Drupal::entityTypeManager()->getStorage('entity_update_tests_cnt');   
  // Make Update Using safeUpdateMain methode.
  if (!EntityUpdate::safeUpdateMain($entity_type->getEntityType())) {
    // Your codes if update failed.
    throw new UpdateException('Entity update failed.');
  }

  // Entity checking process : Compare with new list entities list.
  $ids_new = \Drupal::entityQuery('entity_update_tests_cnt')->execute();

  // Compare two lists.
  $result = array_diff($ids_old, $ids_new);
  if (!empty($result)) {
    // Your codes if update checking failed.
    throw new UpdateException('Entity update checking failed.');
  }

  return "Entity update success";
}

Module : Entity Update