Indexing Product Variations by Attribute

sex-varitiona.php

<?php
// Add sex variation to the schema
add_filter( 'cm_tsfwc_product_fields', 'your_slug_add_stock_status_to_schema' );
function your_slug_add_stock_status_to_schema( $product_fields ) {
	$product_fields[] = [ 'name' => 'sex_variation', 'type' => 'string[]', 'facet' => true ];
	return $product_fields;
}

// Data entry for sex_variation for indexing
add_filter( 'cm_tsfwc_data_before_entry', 'your_slug_add_data_before_entry', 10, 4 );
function your_slug_add_data_before_entry( $formatted_data, $raw_data, $object_id, $schema_name ) {
     if( $schema_name === 'product' ) { // only add data if the schema is product

		 $sex_variation_arr = [];
		 // Check if the product is variable (has variations)
		 if ($raw_data->is_type('variable')) {
			 // Get the product variations
			 $variations = $raw_data->get_variation_attributes();
			 foreach ( $variations['pa_sex'] as $sex_variation ) {
				$sex_variation_arr[] = $sex_variation;
			 }
		 }
		 $formatted_data['sex_variation'] = $sex_variation_arr;
     }
     return $formatted_data;
 }

// Display Sex filter on front end
add_action( 'cm_tsfwc_custom_attributes', 'sex_variation' );
function sex_variation() {
	echo '<div
   	data-facet_name="sex_variation"
    data-attr_facet_name="sex_variation"
    data-title ="' . __( "Sex", 'storefront' ) . '"
    data-attr_label ="' . __( "Sex", 'storefront' ) . '"
    class="cm-tsfwc-shortcode-tags-attribute-filters"
    data-filter_type="refinementList"
    data-settings="' . _wp_specialchars( json_encode( [ "searchable" => false ] ), ENT_QUOTES, "UTF-8", true ) . '"
    ></div>';
}