<?php
  namespace ModuleNamespaceSetup;

    use MagentoEavSetupEavSetup;
    use MagentoEavSetupEavSetupFactory;
    use MagentoFrameworkSetupInstallDataInterface;
    use MagentoFrameworkSetupModuleContextInterface;
    use MagentoFrameworkSetupModuleDataSetupInterface;

    class InstallData implements InstallDataInterface
    {

    /**
     * Customer setup factory
     *
     * @var MagentoCustomerSetupCustomerSetupFactory
     */
    private $_eavSetupFactory;

    /**
     * Init
     *
     * @param MagentoCustomerSetupCustomerSetupFactory
     * $customerSetupFactory
     */
    public function __construct(
        MagentoEavSetupEavSetupFactory $eavSetupFactory
    ) {
        $this->_eavSetupFactory = $eavSetupFactory;
    }

    /**
     * Installs DB schema for a module
     *
     * @param ModuleDataSetupInterface $setup
     * @param ModuleContextInterface $context
     * @return void
     */
    public function install(
        ModuleDataSetupInterface $setup,
        ModuleContextInterface $context
    ) {
        /** @var EavSetup $eavSetup */
        $eavSetup = $this->_eavSetupFactory->create([
            'setup' => $setup
        ]);

        /** @noinspection PhpUnnecessaryFullyQualifiedNameInspection */
        $eavSetup->addAttribute(MagentoCatalogModelProduct::ENTITY,
            'is_feature', [
                'group'                   => 'Product Details',
                'type'                    => 'int',
                'backend'                 => '',
                'frontend'                => '',
                'label'                   => 'Is Feature',
                'input'                   => 'select',
                'source'                  =>
                    'MagentoEavModelEntityAttributeSourceBoolean',
                'visible'                 => true,
                'default'                 => '0',
                'frontend'                => '',
                'unique'                  => false,
                'note'                    => '',
                'required'                => false,
                'sort_order'              => '',
                'global'                  =>
                    MagentoEavModelEntityAttribute
                    ScopedAttributeInterface::SCOPE_GLOBAL,
                'used_in_product_listing' => true,
                'visible_on_front'        => true
            ]);
    }
}

sudo rm -rf var/di var/generation var/cache
sudo php bin/magento setup:upgrade
sudo php bin/magento setup:di:compile
sudo php bin/magento clear:cache