Amazon Elasticsearch Service now provides built-in support for search templates using Mustache on all Elasticsearch 5 domains. Mustache is an open-source logic-less templating engine. You can now use Mustache to build search templates, which make it easy to dynamically generate your Elasticsearch queries. Search templates can help reduce errors and save time when constructing queries. Mustache is now enabled by default on all Amazon Elasticsearch Service 5.1 domains.