Content Comparison

action.auto_create_index: "+csmeter*,+*_nfsconnector,.watches,
.triggered_watches,.watcher-history-*"

Needed to disable automatic index creation, csmeter indices, and Swarm NFS connectors. (v10.1)

cluster.name: <ES_cluster_name>

Provide your Elasticsearch cluster a unique name, which is unrelated to your Swarm cluster name. Do not use periods in the name.

node.name: <ES_node_name>

Optional. Elasticsearch supplies a node name if you do not set one. Do not use periods in the name.

network.host: _site_

Assign a specific hostname or IP address, which requires clients to access the ES server using that address. If you use a hostname, update /etc/hosts. Defaults to the special value, _site_.

cluster.initial_master_nodes

(ES 7+) For first-time bootstrapping of a production ES cluster. Set to an array or comma-delimited list of the hostnames of the master-eligible ES nodes whose votes should be counted in the very first election.

discovery.zen.
minimum_master_nodes: 3

(ES 6 only)  Set to (number of master-eligible nodes / 2, rounded down) + 1. Prevents split-brain scenarios by setting the minimum number of ES nodes online before deciding on electing a new master.

discovery.seed_hosts

(ES 7+) Enables auto-clustering of ES nodes across hosts. Set to an array or comma-delimited list of the addresses of all the master-eligible nodes in the cluster. 

discovery.zen.ping.unicast.hosts: ["es0", "es1"]

(ES 6 only) Set to the list of node names/IPs in your cluster, making sure to include all of your ES servers. By default, multicast is disabled.

gateway.expected_nodes: 4

Add and set to the number of nodes in your ES cluster. Recovery of local shards starts as soon as this number of nodes have joined the cluster. It falls back to the recover_after_nodes value after 5 minutes. This example is for a 4-node cluster.

gateway.recover_after_nodes: 2

Set to the minimum number of ES nodes started before going into operation status, computed as such:

• If total nodes is 1 or 2, set to 1.

• If total nodes is 3 or 4, set to 2.

• If total nodes is 5 to 7, set to your number – 2.

• If total nodes 8 or more, set to your number – 3.

bootstrap.memory_lock: true

Set to lock the memory on startup to verify Elasticsearch never swaps (swapping makes it perform poorly). Verify enough system memory resources are available for all processes running on the server.

To allow the elasticsearch user to disable swapping and to increase the number of open file descriptors, the RPM installer makes these edits to/etc/security/limits.d/10-caringo-elasticsearch.conf: 

# Custom for Caringo Swarm
elasticsearch soft nofile 65536
elasticsearch hard nofile 65536
elasticsearch soft nproc 4096
elasticsearch hard nproc 4096
# allow user 'elasticsearch' memlock
elasticsearch soft memlock unlimited
elasticsearch hard memlock unlimited

path.data: <path_to_data_directory>

By default, path.data goes to /var/lib/elasticsearch with the needed ownership. If you want to move the Elasticsearch data directory, choose a separate, dedicated partition of ample size, and make the elasticsearch user the owner of that directory:

chown -R elasticsearch:elasticsearch <path_to_data_directory>

thread_pool.write.queue_size

The size of the queue used for bulk indexing.

This variable was called threadpool.bulk.queue_size in earlier Elasticsearch versions.