Add all files needed to bring up VM and run agaric.com locally

box/docs/extras/elasticsearch.md

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+[Elasticsearch](https://www.elastic.co/products/elasticsearch) is a search engine based on Lucene. It provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents.
+
+To enable Elasticsearch in Drupal VM just make sure `elasticsearch` is in the list of `installed_extras` in your `config.yml`, and when you build Drupal VM, the latest version of Elasticsearch will be installed.
+
+The URL to connect to the local elasticsearch server (assuming you're using the default `elasticsearch_http_port` of 9200) from Drupal is:
+
+    http://localhost:9200
+
+To access Elasticsearch from the host computer requires changing the IP address to listen on a specific interface, or 0.0.0.0 to listen on all interfaces.
+
+    elasticsearch_network_host: 0.0.0.0
+
+The Elasticsearch server can then be accessed at the configured domain:
+
+    http://drupalvm.test:9200
+
+## Elasticsearch configuration
+
+You can add configuration for Elasticsearch by setting the appropriate variables inside `config.yml` before you build Drupal VM.
+
+    elasticsearch_network_host: localhost
+    elasticsearch_http_port: 9200
+
+For a list of available role variables, see the [`geerlingguy.elasticsearch` Ansible role's README](https://github.com/geerlingguy/ansible-role-elasticsearch#readme).