Fix data nodes out of disk
Elasticsearch is using data nodes to distribute your data inside the cluster. If one or more of these nodes are running out of space, Elasticsearch takes action to redistribute your data within the nodes so all nodes have enough available disk space. This is known as hitting disk watermarks and you can refer to troubleshooting watermark errors for additional information.
If Elasticsearch cannot facilitate enough available space in a node, then you can intervene in one of two ways: