https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=43142

David Nind <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[email protected]
  Text to go in the|                            |This enhancement adds a new
      release notes|                            |local use system
                   |                            |preference,
                   |                            |ElasticsearchReplicas, with
                   |                            |the default value set to 0.
                   |                            |
                   |                            |Technical details:
                   |                            |
                   |                            |This overrides the
                   |                            |index.number_of_replicas
                   |                            |value from
                   |                            |index_config.yaml
                   |                            |when creating indexes.
                   |                            |
                   |                            |The previous hardcoded
                   |                            |default of 1 replica caused
                   |                            |permanently yellow
                   |                            |cluster health on
                   |                            |single-node deployments
                   |                            |(the majority of Koha
                   |                            |installations) because
                   |                            |replica shards cannot be
                   |                            |assigned without
                   |                            |additional nodes.
                   |                            |
                   |                            |With the default of 0,
                   |                            |single-node clusters get
                   |                            |green health status
                   |                            |immediately after
                   |                            |reindexing. Multi-node
                   |                            |deployments can set the
                   |                            |preference to 1 or higher
                   |                            |as needed.
                   |                            |
                   |                            |Changes take effect on the
                   |                            |next reindex.
                   |                            |
                   |                            |The index_config.yaml
                   |                            |default could also be
                   |                            |changed to 0, with the
                   |                            |system preference allowing
                   |                            |organizations to increase
                   |                            |it. Either approach works,
                   |                            |but the system preference
                   |                            |is the important part for
                   |                            |operational control.

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