The following Elasticsearch nodes count towards your Liferay Enterprise Search subscription:

• Data nodes
• Master nodes (including “voting-only”)
• Tribe nodes
• Cross Cluster Search nodes
• Machine Learning nodes

The following node types do NOT count against your subscription:

• Dedicated Coordinating nodes
• Dedicated Ingest nodes

In addition, you may have one dedicated 1-node monitoring cluster as part of your subscription which will NOT count against your total amount, with the following restrictions:

• This cluster may only be used for monitoring data from the production cluster
• This monitoring node should have the non-production license applied to it
• The only plugins which may be used, besides Monitoring itself, are Security and Watcher (to allow alerting on monitoring data). 

Please note that if a node combines multiple roles, you will need a license for that node if any of the roles require a license. However, if more than one role requires a license, you don't need multiple licenses for that node. Each node requires at most one license for all the roles it carries.