Gets information about the index fields configured for the searchdomain.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/cloudsearch/describe-index-fields.html
| aws cloudsearch describe-index-fields --domain-name dev-purchxa |
| ruby on rails - AWS Cloudsearch Uploading Documents - Stack Overflow : http://stackoverflow.com/questions/32080992/aws-cloudsearch-uploading-documents |