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Update docs for cluster API #30468

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merged 13 commits into from
Aug 20, 2018
25 changes: 16 additions & 9 deletions docs/reference/cluster.asciidoc
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["float",id="cluster-nodes"]
== Node specification

Most cluster level APIs allow to specify which nodes to execute on (for
example, getting the node stats for a node). Nodes can be identified in
the APIs either using their internal node id, the node name, address,
custom attributes, or just the `_local` node receiving the request. For
example, here are some sample executions of nodes info:
Most cluster level APIs allow to specify nodes (for example, getting
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Can you add something to sentence to explain that specifying nodes limits the results to those nodes? At least, I think that is what specifying the node does here, but I'm no expect.

the node stats for a certain node). Nodes can be identified in
the APIs either using their internal node id, node name, address,
built-in/custom attributes, or `_local`, `_master`, `_all` for the relevant nodes.
Here are examples of using nodes info API for each case:

[source,js]
--------------------------------------------------
# Local
# Local node
GET /_nodes/_local
# Address
# Master node
GET /_nodes/_master
# All nodes
GET /_nodes/_all
# Using address
GET /_nodes/10.0.0.3,10.0.0.4
GET /_nodes/10.0.0.*
# Names
# Using node name
GET /_nodes/node_name_goes_here
GET /_nodes/node_name_goes_*
# Attributes (set something like node.attr.rack: 2 in the config)
# Using built-in attributes (master, data, ingest or coordinating_only)
GET /_nodes/master:false,data:false,ingest:true
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This is equivalent to the simpler GET /_nodes/ingest:true so I don't think we should have this.

GET /_nodes/coordinating_only:true
# Using custom attributes (You need to set something like `node.attr.rack: 2` in the config)
GET /_nodes/rack:2
GET /_nodes/ra*:2
GET /_nodes/ra*:2*
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