Magento 2 : admin product edit page custom attribute with customised Ui-Select

Question

I have created product attribute with input type select below, I have put attribute create code.

$eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
 $eavSetup->addAttribute(Product::ENTITY, 'seller_id', [
 'type' => 'int',
 'label' => 'Seller',
 'input' => 'select',
 'required' => true,
 'sort_order' => 1,
 'source' => 'Kunj\Seller\Model\Config\Source\Sellers',
 'global' => ScopedAttributeInterface::SCOPE_WEBSITE,
 'user_defined' => true,
 'visible_on_front' => false,
 'used_in_product_listing' => true,
 'is_used_in_grid' => true,
 'is_visible_in_grid' => true,
 'is_filterable_in_grid' => true,
 'group' => 'General'
 ]);

Now, everything is working fine with that attribute, I have attached screenshot.

enter image description here

Now, I want to display without the default option like this.

enter image description here

And option should appear with ajax and options list should be based on search keyword.

Answer 1

@kunj Could you share here the Kunj\Seller\Model\Config\Source\Sellers file