eZ\Publish\Core\Persistence\Legacy\Content\Type\Handler::getSearchableFieldMap PHP Method

    public function getSearchableFieldMap()
    {
        $fieldMap = [];
        $rows = $this->contentTypeGateway->getSearchableFieldMapData();
        foreach ($rows as $row) {
            $fieldMap[$row['content_type_identifier']][$row['field_definition_identifier']] = ['field_type_identifier' => $row['field_type_identifier'], 'field_definition_id' => $row['field_definition_id']];
        }
        return $fieldMap;
    }