Both the engine, and each plugin, are built and tested with a range of JDKs (a subset of 8, 11 LTS, 14, 15, and 17), across multiple operating systems (Linux, Windows, FreeBSD, and MacOS).
The OpenSearch distribution is comprised of the engine and a dozen plugins. This, however, doesn’t tell the whole story. LTS releases of JDKs focus on stability, therefore you can expect future versions of OpenSearch to always default to bundling a LTS JDK. This change was primarily driven by the fact that JDK 11 is a Long-Term Support (LTS) release, and JDK 15 is not. At the time of the fork OpenSearch inherited bundling OpenJDK 15, and eight releases have used AdoptOpenJDK 15.0.1+9 as the default runtime, replaced with Adoptium (Temurin) 11.0.14.1+1 in OpenSearch 1.3.0.
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