wp_ajax_search_plugins()

function wp_ajax_search_plugins() {
	check_ajax_referer( 'updates' );

	$pagenow = isset( $_POST['pagenow'] ) ? sanitize_key( $_POST['pagenow'] ) : '';
	if ( 'plugins-network' === $pagenow || 'plugins' === $pagenow ) {
		set_current_screen( $pagenow );
	}

	/** @var WP_Plugins_List_Table $wp_list_table */
	$wp_list_table = _get_list_table( 'WP_Plugins_List_Table', array(
		'screen' => get_current_screen(),
	) );

	$status = array();

	if ( ! $wp_list_table->ajax_user_can() ) {
		$status['errorMessage'] = __( 'Sorry, you are not allowed to manage plugins for this site.' );
		wp_send_json_error( $status );
	}

	// Set the correct requester, so pagination works.
	$_SERVER['REQUEST_URI'] = add_query_arg( array_diff_key( $_POST, array(
		'_ajax_nonce' => null,
		'action'      => null,
	) ), network_admin_url( 'plugins.php', 'relative' ) );

	$GLOBALS['s'] = wp_unslash( $_POST['s'] );

	$wp_list_table->prepare_items();

	ob_start();
	$wp_list_table->display();
	$status['count'] = count( $wp_list_table->items );
	$status['items'] = ob_get_clean();

	wp_send_json_success( $status );
}