java.lang.IllegalArgumentException: unknown setting [node.rack] please check that any required plugins are installed, or check the breaking changes documentation for removed settings Node level attributes used for allocation filtering, forced awareness or other node identification / grouping must be prefixed with node.attr . In previous versions it was possible to specify node attributes with the node. prefix. All node attributes except of node.master , node.data and node.ingest must be moved to the new node.attr. namespace. Unknown setting mlockall Replace the bootstrap.mlockall with bootstrap.memory_lock Unable to lock JVM Memory: error=12, reason=Cannot allocate memory Edit: /etc/security/limits.conf and add the following lines elasticsearch soft memlock unlimited elasticsearch hard memlock unlimited Edit: /usr/lib/systemd/system/elasticsearch.service uncomment the line Limi...