OpenSearch/docs/reference/migration/migrate_7_0/cluster.asciidoc

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[[breaking_70_cluster_changes]]
=== Cluster changes
==== `:` is no longer allowed in cluster name
Due to cross-cluster search using `:` to separate a cluster and index name,
cluster names may no longer contain `:`.
==== new default for `wait_for_active_shards` parameter of the open index command
The default value for the `wait_for_active_shards` parameter of the open index API
is changed from 0 to 1, which means that the command will now by default wait for all
primary shards of the opened index to be allocated.