When you decrease the replicas dynamically, the data is deleted from
wherever nodes they reside in. Then when you increase it back dynamically,
ES will then make new copies of the shards on-the-fly. Also when you set
index.number_of_replicas in the YML file, that only applies to new indexes
created after start up. If you already had an existing index prior to that
change in the YML file, no change will be made to the replica count of that
prior existing index.
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