Exclude posts with a term in a taxonomy from search

exclude_posts_with_term.php

<?php
/**
 * Exclude posts with term 'bananas' from Search.
 */
function cc_search_filter( $query ) {
	if ( ! is_admin() && $query->is_main_query() ) {
		if ( $query->is_search ) {
			$query->set(
				'tax_query',
				array(
					array(
						'taxonomy' => 'fruit',
						'field' => 'slug',
						'terms' => 'bananas',
						'operator' => 'NOT IN'
					),
				)
			);
		}
	}
}
add_action( 'pre_get_posts', 'cc_search_filter' );