IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Modules

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Modules

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This section contains modules responsible for various aspects of the functionality in Elasticsearch. Each module has settings which may be:

static: These settings must be set at the node level, either in the elasticsearch.yml file, or as an environment variable or on the command line when starting a node. They must be set on every relevant node in the cluster.
dynamic: These settings can be dynamically updated on a live cluster with the cluster-update-settings API.

The modules in this section are:

Discovery and cluster formation: How nodes discover each other, elect a master and form a cluster.
Shard allocation and cluster-level routing: Settings to control where, when, and how shards are allocated to nodes.
Gateway: How many nodes need to join the cluster before recovery can start.
HTTP: Settings to control the HTTP REST interface.
Indices: Global index-related settings.
Network: Controls default network settings.
Node client: A Java node client joins the cluster, but doesn’t hold data or act as a master node.
Plugins: Using plugins to extend Elasticsearch.
Snapshot/Restore: Backup your data with snapshot/restore.
Thread pools: Information about the dedicated thread pools used in Elasticsearch.
Transport: Configure the transport networking layer, used internally by Elasticsearch to communicate between nodes.
Remote clusters: Remote clusters are used in features that work by connecting across clusters on the transport layer.
Cross-cluster search: Cross-cluster search enables executing search requests across more than one cluster without joining them and acts as a federated client across them.

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