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When is each API best for what?
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Reindex is the concept of copying existing data from a source index to a destination index which can be inside the same or a different cluster. Elasticsearch has a dedicated endpoint _reindex for this purpose. A reindexing is mostly required for updating mapping or settings.
REINDEX provides a way to reduce the space consumption of the index by writing a new version of the index without the dead pages. See Section 23.2 for more information. You have altered a storage parameter (such as fillfactor) for an index, and wish to ensure that the change has taken full effect.
You have the answer inside: "Reindex does not copy the settings from the source index. Mappings, shard counts, replicas, and so on must be configured ahead of time."
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