I am using the following code to limit the fields that woocommerce searches in when you search for an order:

/**
* Limit woocommerce order search fields. 
*/
function custom_woocommerce_shop_order_search_fields( $search_fields ) {

    // error_log( 'currently searching in these order fields: ' . print_r($search_fields, true) );
    unset( $search_fields );
    $search_fields[] = '_order_key';
    $search_fields[] = '_billing_company';
    $search_fields[] = '_billing_email';

    // error_log( 'now only searching in these order fields: ' . print_r($search_fields, true) );
    return $search_fields;

}
add_filter( 'woocommerce_shop_order_search_fields', 'custom_woocommerce_shop_order_search_fields' );

This limits the search fields to Order ID, company and email only, speeding up order search. I need to have a dropdown along with the search field which will have Order ID, Billing Company, Billing Email as values. If we select Order ID, then the search should happen in Order IDs(_order_key) only, if we select Billing Company, then the search should happen in Billing Company(_billing_company) field only and so on. How to add this dropdown along with order search?

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