Operating system and JVM compatibility

• We recommend installing OpenSearch on RHEL- or Debian-based Linux distributions that use systemd, such as CentOS, Amazon Linux 2, and Ubuntu (LTS). OpenSearch should work on many Linux distributions, but we only test a handful.

• The OpenSearch tarball ships with a compatible version of Java in the jdk directory. To find its version, run ./jdk/bin/java -version. For example, the OpenSearch 1.0.0 tarball ships with Java 15 (non-LTS).

  To use a different Java installation, set the OPENSEARCH_JAVA_HOME environment variable to the Java install location. We recommend Java 11 (LTS), but OpenSearch also works with Java 8.