It is a common misconception that both Elasticsearch and OpenSearch are similar search engines. Since OpenSearch’s general availability in 2021, Elasticsearch has outpaced OpenSearch by 4x in key innovations and features resulting in significantly faster performance. More importantly, Elasticsearch accomplished this with significantly improved scalability while using far fewer resources. Elasticsearch and OpenSearch are clearly not the same.
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Pace of Innovation
Since the fork of an older version of Elasticsearch, OpenSearch hasn't kept up with the pace of innovation. Since OpenSearch GA, Elasticsearch has outpaced feature innovation by 4x.