elasticsearch. guide

Allow to update cluster wide specific settings. Settings updated can either be persistent (applied cross restarts) or transient (will not survive a full cluster restart). Here is an example:

curl -XPUT localhost:9200/_cluster/settings -d '{
    "persistent" : {
        "discovery.zen.minimum_master_nodes" : 2
    }
}'

Or:

curl -XPUT localhost:9200/_cluster/settings -d '{
    "transient" : {
        "discovery.zen.minimum_master_nodes" : 2
    }
}'

There is a specific list of settings that can be updated, those include:

• cluster.blocks.read_only: Have the whole cluster read only (indices do not accept write operations), metadata is not allowed to be modified (create or delete indices).
• discovery.zen.minimum_master_nodes
• indices.recovery.concurrent_streams
• cluster.routing.allocation.node_initial_primaries_recoveries, cluster.routing.allocation.node_concurrent_recoveries
• cluster.routing.allocation.cluster_concurrent_rebalance
• cluster.routing.allocation.awareness.attributes
• cluster.routing.allocation.awareness.force.*
• cluster.routing.allocation.disable_allocation
• cluster.routing.allocation.disable_replica_allocation
• cluster.routing.allocation.include.*
• cluster.routing.allocation.exclude.*
• indices.cache.filter.size
• indices.ttl.interval
• indices.recovery.file_chunk_size, indices.recovery.translog_ops, indices.recovery.translog_size, indices.recovery.compress, indices.recovery.concurrent_streams, indices.recovery.max_size_per_sec.

Logger values can also be updated by setting logger. prefix. More settings will be allowed to be updated.

Cluster wide settings can be returned using curl -XGET localhost:9200/_cluster/settings.