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improve docs based on review commments:

This commit is contained in:
Simon Willnauer 2017-01-11 14:52:41 +01:00
parent e23de3229f
commit ea0e72f3d9
1 changed files with 14 additions and 10 deletions
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24
docs/reference/modules/cross-cluster-search.asciidoc
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@ -14,7 +14,8 @@ the remote cluster.
Remote clusters can either be configured as part of the `elasticsearch.yml` file or be dynamically updated via
the <<cluster settings API, cluster-update-settings>>. If a remote cluster is configured via `elasticsearch.yml` only
the nodes with the configuration set will be connecting to the remote cluster. Remote clusters set via the
the nodes with the configuration set will be connecting to the remote cluster in which case federated search requests
will have to be sent specifically to those nodes". Remote clusters set via the
<<cluster settings API, cluster-update-settings>> will be available on every node in the cluster.
The `elasticsearch.yml` config file for a _cross cluster search_ node just needs to list the
@ -30,12 +31,13 @@ search:
seeds: 127.0.0.1:9301
--------------------------------
<1> `cluster_one` and `cluster_two` are arbitrary names representing the connection to each cluster. These names are subsequently used to distinguish between local and remote indices.
<1> `cluster_one` and `cluster_two` are arbitrary cluster aliases representing the connection to each cluster.
These names are subsequently used to distinguish between local and remote indices.
[float]
=== Using cross cluster search
To search the `twitter` index on remote cluster `cluster_1` the index name must be prefixed with the cluster name
To search the `twitter` index on remote cluster `cluster_1` the index name must be prefixed with the cluster alias
separated by a `:` character:
[source,js]
@ -46,8 +48,8 @@ POST /cluster_one:twitter/tweet/_search
}
--------------------------------------------------
In contrast to the `tribe` feature cross cluster search can also search indices with the same name on different clusters:
In contrast to the `tribe` feature cross cluster search can also search indices with the same name on different
clusters:
[source,js]
--------------------------------------------------
@ -58,7 +60,8 @@ POST /cluster_one:twitter,twitter/tweet/_search
--------------------------------------------------
Search results are disambiguated the same way as the indices are disambiguated in the request. Even if index names are
identical these indices will be treated as different indices when results are merged. All results retrieved from a remote index
identical these indices will be treated as different indices when results are merged. All results retrieved from a
remote index
will be prefixed with their remote cluster name:
[source,js]
@ -106,8 +109,9 @@ will be prefixed with their remote cluster name:
=== Cross cluster search settings
* `search.remote.connections_per_cluster` - the number of nodes to connect to per remote cluster. The default is `3`
* `search.remote.initial_connect_timeout` - the time to wait for remote connections to be established when the node starts. The default is `30s`.
* `search.remote.node_attribute` - a node attribute to filter out nodes that are eligible as a gateway node in the remote cluster.
For instance a node can have a node attribute `node.attr.gateway: true` such that only nodes with this attribute
will be connected to if `search.remote.node_attribute` is set to `gateway`
* `search.remote.initial_connect_timeout` - the time to wait for remote connections to be established when the node
starts. The default is `30s`.
* `search.remote.node_attribute` - a node attribute to filter out nodes that are eligible as a gateway node in the
remote cluster. For instance a node can have a node attribute `node.attr.gateway: true` such that only nodes with this
attribute will be connected to if `search.remote.node_attribute` is set to `gateway`