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Cluster State

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Cluster State

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The cluster state API allows to get a comprehensive state information of the whole cluster.

$ curl -XGET 'http://localhost:9200/_cluster/state'

By default, the cluster state request is routed to the master node, to ensure that the latest cluster state is returned. For debugging purposes, you can retrieve the cluster state local to a particular node by adding local=true to the query string.

Response Filters

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As the cluster state can grow (depending on the number of shards and indices, your mapping, templates), it is possible to filter the cluster state response specifying the parts in the URL.

$ curl -XGET 'http://localhost:9200/_cluster/state/{metrics}/{indices}'

metrics can be a comma-separated list of

version: Shows the cluster state version.
master_node: Shows the elected master_node part of the response
nodes: Shows the nodes part of the response
routing_table: Shows the routing_table part of the response. If you supply a comma separated list of indices, the returned output will only contain the indices listed.
metadata: Shows the metadata part of the response. If you supply a comma separated list of indices, the returned output will only contain the indices listed.
blocks: Shows the blocks part of the response

A couple of example calls:

# return only metadata and routing_table data for specified indices
$ curl -XGET 'http://localhost:9200/_cluster/state/metadata,routing_table/foo,bar'

# return everything for these two indices
$ curl -XGET 'http://localhost:9200/_cluster/state/_all/foo,bar'

# Return only blocks data
$ curl -XGET 'http://localhost:9200/_cluster/state/blocks'

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