May seem like a simple question, but what are all of the impacts when ElasticSearch is restarted in a running Magento 2.3.x store?
Do indexes need to be reindexed?
Any other items that have to be run/redone?
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The impact will be during that period of time(When ES is down) it may happen that Catalog Search results and Category Pages may not be accessible.
When Elasticsearch down then catalog_search index should be disabled for some time or switch to another search engine (i.e. MySQL).
For other items, it depends on a few other things as well
- Elasticsearch clause parameter re-configuration
- If Magento having any third party module especially for Elasticsearch then it may require Indexing
- Why Elasticsearch restarted (It was for version upgrade/downgrade )
- Any OS upgrade was triggered
For a safe side, we should reindex once Elastic Search is restarted
php bin/magento indexer:reindex catalogsearch_fulltext