$this->fieldPluginCache[$field_type] = $this->fieldPluginManager->createInstance($plugin_id, ['core' => 7], $migration);
}
$this->fieldPluginCache[$field_type]
$this->fieldPluginCache[$field_type] = $this->fieldPluginManager->createInstance($plugin_id, ['core' => 7], $migration);
}
$this->fieldPluginCache[$field_type]