Page Comparison

...

1. Set the discovery.zen.minimum_master_nodes value in the /etc/elasticsearch/elasticsearch.yml config file to be: (number of master-eligible-nodes/2, rounded down) + 1 when the elasticsearch cluster is first configured.
   Verify the number is smaller than the number of currently available nodes. Run the following command now to set that number to be <current_min_master_nodes>: (current number of master-eligible-nodes/2, rounded down) + 1 if not.

   Code Block
   language bash
   curl -s -XPUT 'http://ES_NODE:9200/_cluster/settings' \ --data-binary '{"transient": {"discovery.zen.minimum_master_nodes" : "<current_min_master_nodes>"}}'

2. Follow the Elasticsearch rolling restart procedure for the version:

   • ES Rolling Upgrades (current7.17)

   • ES 5.6 Rolling Upgrades

   • ES 2.3.3 Rolling Restarts

3. This step is only needed if using an elasticsearch version before Elasticsearch 7. Reset discovery.zen.minimum_master_nodes to its original value, or adjust it based on the current number of expected available nodes after completing the rolling restart:

   Code Block
   language bash
   curl -s -XPUT 'http://ES_NODE:9200/_cluster/settings' \ --data-binary '{"transient": {"discovery.zen.minimum_master_nodes" : "<original_min_master_nodes>"}}'