The Elasticsearch Stack components of LME are installed on a single server using Docker for Linux, and this is the only supported installation. However, if LME is installed on a single server and the hard drive fails or the server crashes then there is the potential for all of the logs to be lost. It is therefore recommended that LME installers aim to configure a multi-server cluster to help ensure data resiliency.
The Elastic website contains documentation about how to install and configure multi-server clusters and in particular mentions the requirement for a minimum of three master nodes (which in turn implies a minimum of two data nodes) in their node documentation. LME users should follow the official guidance when configuring their own cluster.