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To replicate time series indices, you configure an auto-follow pattern so that each new index in the series is replicated automatically. Whenever the name of a new index on the remote cluster matches the auto-follow pattern, a corresponding follower index is added to the local cluster.
::::{note} Auto-follow patterns only match open indices on the remote cluster that have all primary shards started. Auto-follow patterns do not match indices that can’t be used for {{ccr-init}} such as closed indices or {{search-snaps}}. Avoid using an auto-follow pattern that matches indices with a read or write block. These blocks prevent follower indices from replicating such indices. ::::
You can also create auto-follow patterns for data streams. When a new backing index is generated on a remote cluster, that index and its data stream are automatically followed if the data stream name matches an auto-follow pattern. If you create a data stream after creating the auto-follow pattern, all backing indices are followed automatically.
The data streams replicated from a remote cluster by CCR are protected from local rollovers. The promote data stream API can be used to turn these data streams into regular data streams.
Auto-follow patterns are especially useful with {{ilm-cap}}, which might continually create new indices on the cluster containing the leader index.
$$$ccr-access-ccr-auto-follow$$$ To start using {{ccr}} auto-follow patterns from Stack Management in {{kib}}, select Cross-Cluster Replication from the side navigation and choose the Auto-follow patterns tab.