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Furthermore, with respect to schema changes, ElasticSearch will refuse to make backwards-incompatible changes. So for either search engine, you'll need to get comfortable at some point with the procedure for creating a new index with the new schema or mapping, reindexing your data, and hot-swapping the Solr Core or ElasticSearch Alias.

Hot-swaps of ElasticSearch aliases are how we do it at my company. It's how we produce a rolling archive.

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