PHP Removes the old "[vc_]" shortcodes found in post_content during migrations. If other shortcodes not specific to vc_* are preset, the regex pattern will need to be updated.

remove_vc_shortcodes.php

<?php

// Add to functions.php
// Remove the "[vc_*]" shortcodes usually found during migrations
// Add this shortcode to a debug/test page and visit it
// The page will render and dump all new post/pages to the screen
// This can take a long time if there are a lot of pages/posts
add_shortcode('remove-vc-shortcodes', 'remove_vc_shortcodes');
function remove_vc_shortcodes() {
	$pattern = '/\[\/?vc_.*\]?/i';
	$blog_args = array(
		'post_type' => 'post',
		'post_status' => array('draft', 'publish'),
		'posts_per_page' => -1
	);
	$blog_posts = get_posts($blog_args);
	foreach($blog_posts as $i => $p){
		$string = $p->post_content;
		$new_s = preg_replace($pattern, '', $string);
		$p->post_content = $new_s;
		wp_update_post($p);
	}

	$page_args = array(
		'post_type' => 'page',
		'post_status' => array('draft', 'publish'),
		'posts_per_page' => -1
	);
	$page_posts = get_posts($page_args);
	foreach($page_posts as $i => $p){
		$string = $p->post_content;
		$new_s = preg_replace($pattern, '', $string);
		$p->post_content = $new_s;
		wp_update_post($p);
	}

	ob_start();
	?>
		<h1>Posts</h1>
		<pre>
			<?php var_dump($blog_posts); ?>
		</pre>
		<h1>Pages</h1>
		<pre>
			<?php var_dump($blog_posts); ?>
		</pre>
	<?php
	return ob_get_clean();
}