message: doc(search): Add documentation on opensearch provider
diff: @@ -117,7 +117,8 @@ within your instance. The configuration options are documented in the
  The underlying functionality uses either the official ElasticSearch client
  version 7.x (meaning that ElasticSearch version 7 is the only one confirmed to
  -be supported), or the OpenSearch client, when the `aws` provider is configured.
  +be supported), or the OpenSearch client, when the `aws` or `opensearch `provider
  +is configured.
  Should you need to create your own bespoke search experiences that require more
  than just a query translator (such as faceted search or Relay pagination), you
  @@ -200,6 +201,20 @@ search:
  password: changeme
  ```
  +### OpenSearch
  +
  +OpenSearch can be self hosted for example with the [official docker image](https://hub.docker.com/r/opensearchproject/opensearch). The configuration requires only the node and authentication.
  +
  +```yaml
  +search:
  + elasticsearch:
  + provider: opensearch
  + node: http://0.0.0.0:9200
  + auth:
  + username: opensearch
  + password: changeme
  +```
  +
  ### Others
  Other ElasticSearch instances can be connected to by using standard
  