Tell SearchWP to index both value and label from ACF Select field

searchwp-customizations.php

<?php

// Tell SearchWP to index both value and label from ACF Select field.
add_filter( 'searchwp\source\post\attributes\meta', function( $meta_value, $args ) {
	$acf_field_name = 'state'; // ACF Select field name.

	if ( $acf_field_name !== substr( $args['meta_key'], strlen( $args['meta_key'] ) - strlen( $acf_field_name ) ) ) {
		return $meta_value;
	}

	if ( ! is_array( $meta_value ) ) {
		$meta_value = [ $meta_value ];
	}

	$acf_field_object = get_field_object( $acf_field_name, $args['post_id'] );

	// Append the Select label to the Select value.
	if ( isset( $acf_field_object['choices'] ) ) {
		foreach ( $meta_value as $key => $val ) {
			if ( isset( $acf_field_object['choices'][ $val ] ) ) {
				$meta_value[ $key ] .= ' ' . (string) $acf_field_object['choices'][ $val ];
			}
		}
	}

	return $meta_value;
}, 20, 2 );