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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.