After installing Elasticsearch it needs the following configuration changes before it can be used productively.
Precondition: make sure your machine has a fixed IP address.
|Reduce the kernel’s tendency to swap. Still allow to swap in emergency conditions.||Set vm.swappiness=1|
|Set the Java heap size to half of the available memory but not greater than 16 GB|
Example for 2 GB:
|Make Elasticsearch node accessible under a public IP address (instead of localhost only)|
Set network.host to your fixed IP address
Retrieve IP address information using /sbin/ifconfig
|Ensure that your Elasticsearch nodes are in the same Elasticsearch cluster and don't influence other Elasticsearch installations||Set cluster.name to something unique, e.g. ElasticDigaSystem|
|Give your node a unique (and self-explaining name)||Set node.name to something unique, e.g. DigaSystemNode1|
|Prevent wildcard deleting of indices||Set action.destructive_requires_name to true|
|Disable automatic index creation|
Set action.auto_create_index to 0
Breaking change in Elasticsearch 6.x:
Set action.auto_create_index to ".watches,.triggered_watches,.watcher-history-*"
Links with more detailed information: