WP JOB MANAGER suggestion filter

// Suggestion filter in Job listing page
function get_job_listing_taxonomy_on_ajax($query_args){

    // Get the array of the taxonomy of type job_listing_category
    $taxonomy_array = $query_args['tax_query'];
    if(is_array($taxonomy_array)){
        foreach ($taxonomy_array as $key => $ta) {
            if($ta['taxonomy'] == 'job_listing_category' ){
                $cat_terms = $ta['terms'];
                $ta_cateogory_index = $key;
            }
        }
    }
    // Now get the term id of suggestion taxonomy
    if($cat_terms) {
        $suggestion_terms = [];
        foreach ($cat_terms as $key => $term_id) {
            $result = get_term_by('id', $term_id, 'suggestion' );
            if($result) {
                $suggestion_terms[] = $term_id;
                foreach ($query_args['tax_query'][$ta_cateogory_index]['terms'] as $key => $value) {
                    if($value == $term_id){
                        // Now delete these term ids from original job_listing_category taxonomy 
                        unset($query_args['tax_query'][$ta_cateogory_index]['terms'][$key]);
                    }
                }
            }


        }
    }
    // If the job_listing_category taxonomy array is doesn't contain any term id then remove this array
    if(!sizeof($query_args['tax_query'][$ta_cateogory_index]['terms'])){
        unset($query_args['tax_query'][$ta_cateogory_index]);
    }
    // Now add new taxonomy array to query_args
    if ( ! empty( $suggestion_terms ) ) {
        $field    = is_numeric( $suggestion_terms[0] ) ? 'term_id' : 'slug';
        $operator = 'all' === get_option( 'job_manager_category_filter_type', 'all' ) && sizeof( $suggestion_terms ) > 1 ? 'AND' : 'IN';
        $query_args['tax_query'][] = array(
            'taxonomy'         => 'suggestion',
            'field'            => $field,
            'terms'            => array_values( $suggestion_terms ),
            'include_children' => $operator !== 'AND' ,
            'operator'         => $operator
            );
    }

    return $query_args;
}
add_filter('get_job_listings_query_args','get_job_listing_taxonomy_on_ajax');