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Add migration note for remote cluster settings (#33632) 

The remote cluster settings search.remote.* have been renamed to
cluster.remote.* and are automatically upgraded in the cluster state on
gateway recovery, and on put. This commit adds a note to the migration
docs for these changes.
This commit is contained in:
Jason Tedor 2018-09-12 13:37:11 -04:00 committed by GitHub
parent 901d8035d9
commit c023f67c5d
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13
docs/reference/migration/migrate_7_0/settings.asciidoc
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@ -40,3 +40,16 @@ will be removed in the future, thus requiring HTTP to always be enabled.
This setting has been removed, as disabling http pipelining support on the server
provided little value. The setting `http.pipelining.max_events` can still be used to
limit the number of pipelined requests in-flight.
==== Cross-cluster search settings renamed
The cross-cluster search remote cluster connection infrastructure is also used
in cross-cluster replication. This means that the setting names
`search.remote.*` used for configuring cross-cluster search belie the fact that
they also apply to other situations where a connection to a remote cluster as
used. Therefore, these settings have been renamed from `search.remote.*` to
`cluster.remote.*`. For backwards compatibility purposes, we will fallback to
`search.remote.*` if `cluster.remote.*` is not set. For any such settings stored
in the cluster state, or set on dynamic settings updates, we will automatically
upgrade the setting from `search.remote.*` to `cluster.remote.*`. The fallback
settings will be removed in 8.0.0.

5
server/src/main/java/org/elasticsearch/transport/RemoteClusterAware.java
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@ -52,6 +52,11 @@ import java.util.stream.Stream;
*/
public abstract class RemoteClusterAware extends AbstractComponent {
static {
// remove search.remote.* settings in 8.0.0
assert Version.CURRENT.major < 8;
}
public static final Setting.AffixSetting<List<String>> SEARCH_REMOTE_CLUSTERS_SEEDS =
Setting.affixKeySetting(
"search.remote.",

5
server/src/main/java/org/elasticsearch/transport/RemoteClusterService.java
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@ -66,6 +66,11 @@ import static org.elasticsearch.common.settings.Setting.boolSetting;
*/
public final class RemoteClusterService extends RemoteClusterAware implements Closeable {
static {
// remove search.remote.* settings in 8.0.0
assert Version.CURRENT.major < 8;
}
public static final Setting<Integer> SEARCH_REMOTE_CONNECTIONS_PER_CLUSTER =
Setting.intSetting("search.remote.connections_per_cluster", 3, 1, Setting.Property.NodeScope, Setting.Property.Deprecated);