Change default search URL slug in wordpress with Custop Post Type as Search target

Hi Vijay you can try to add post_type as query perameter in you redirect url check following changes in your code.

function wp_change_search_url() { 
    if ( is_search() && ! empty( $_GET['s'] ) ) { 
        get_query_var( 'post_type' );
        wp_redirect( home_url( "/search/" ) . urlencode( get_query_var( 's' ) ) . '?post_type=" . get_query_var( "post_type' ) ); exit(); 
    }
} 
add_action( 'template_redirect', 'wp_change_search_url' );