expand_shortcodes_in_excerpts.php

/* Allow Easy Testimonials and Visual Composer shortcodes in excerpts */

add_filter( 'strip_shortcodes_tagnames', 'gbol_allow_shortcodes' );
function gbol_allow_shortcodes( $tags_to_remove ) {

	$allowed_shortcodes = array( 'random_testimonial', 'single_testimonial', 'testimonials', 'testimonials_cycle', 'testimonials_grid',
								'vc_row', 'vc_column', 'vc_column_text' );

	foreach( $allowed_shortcodes as $tag ) {
		if ( $key = array_search( $tag, $tags_to_remove  ) ) {
			unset( $tags_to_remove[ $key ] );
		}
	}

	return $tags_to_remove;
}

/* Allow Easy Testimonials and Visual Composer shortcodes in excerpts used as meta descriptions */

if ( is_plugin_active( 'wordpress-seo/wp-seo.php' ) ) { 

	add_filter( 'wpseo_replacements', 'gbol_seo_replacements' );
	function gbol_seo_replacements( $replacements ) {
		global $post;
		
		if ( ! is_singular() ) {
			return $replacements;
		}

		$text = get_the_excerpt();
		if ( strlen( $text ) < 2 ) {
			$text = strip_tags( do_shortcode( $post->post_content ) );
		}
		
		$text = wp_trim_words( $text, 20, '' );

		$replacements['%%excerpt%%'] = $text;

		return $replacements;
	}

}