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Update discovery-ec2.asciidoc (#28925) 

* Be more clear about the need to defining tags in EC2 to be able to filter
ES instances.
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Andrei Stefan 2019-01-11 11:24:31 +02:00 committed by GitHub
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docs/plugins/discovery-ec2.asciidoc
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@ -185,9 +185,9 @@ Management Console. It should look similar to this.
===== Filtering by Tags ===== Filtering by Tags
The ec2 discovery can also filter machines to include in the cluster based on tags (and not just groups). The settings The ec2 discovery can also filter machines to include in the cluster based on tags (and not just groups). The settings
to use include the `discovery.ec2.tag.` prefix. For example, setting `discovery.ec2.tag.stage` to `dev` will only to use include the `discovery.ec2.tag.` prefix. For example, if you defined a tag `stage` in EC2 and set it to `dev`,
filter instances with a tag key set to `stage`, and a value of `dev`. Several tags set will require all of those tags setting `discovery.ec2.tag.stage` to `dev` will only filter instances with a tag key set to `stage`, and a value
to be set for the instance to be included. of `dev`. Adding multiple `discovery.ec2.tag` settings will require all of those tags to be set for the instance to be included.
One practical use for tag filtering is when an ec2 cluster contains many nodes that are not running Elasticsearch. In One practical use for tag filtering is when an ec2 cluster contains many nodes that are not running Elasticsearch. In
this case (particularly with high `discovery.zen.ping_timeout` values) there is a risk that a new node's discovery phase this case (particularly with high `discovery.zen.ping_timeout` values) there is a risk that a new node's discovery phase