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045dd4ad48
This commit introduces the ability for the core Elasticsearch JAR to be a multi-release JAR containing code that is compiled for JDK 8 and code that is compiled for JDK 9. At runtime, a JDK 8 JVM will ignore the JDK 9 compiled classfiles, and a JDK 9 JVM will use the JDK 9 compiled classfiles instead of the JDK 8 compiled classfiles. With this work, we utilize the new JDK 9 API for obtaining the PID of the running JVM, instead of relying on a hack. For now, we want to keep IDEs on JDK 8 so when the build is in an IDE we ignore the JDK 9 source set (as otherwise the IDE would give compilation errors). However, with this change, running Gradle from the command-line now requires JAVA_HOME and JAVA_9_HOME to be set. This will require follow-up work in our CI infrastructure and our release builds to accommodate this change. Relates #28051