Cluster changesedit

: is no longer allowed in cluster nameedit

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 commandedit

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.

Shard preferences _primary, _primary_first, _replica, and _replica_first are removededit

These shard preferences are removed in favour of the _prefer_nodes and _only_nodes preferences.