Update contributing docs to JDK 12
JDK 12 is now required for compilation. This commit updates the docs to reflect this.
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@ -92,11 +92,11 @@ Contributing to the Elasticsearch codebase
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**Repository:** [https://github.com/elastic/elasticsearch](https://github.com/elastic/elasticsearch)
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JDK 11 is required to build Elasticsearch. You must have a JDK 11 installation
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JDK 12 is required to build Elasticsearch. You must have a JDK 12 installation
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with the environment variable `JAVA_HOME` referencing the path to Java home for
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your JDK 11 installation. By default, tests use the same runtime as `JAVA_HOME`.
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your JDK 12 installation. By default, tests use the same runtime as `JAVA_HOME`.
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However, since Elasticsearch supports JDK 8, the build supports compiling with
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JDK 11 and testing on a JDK 8 runtime; to do this, set `RUNTIME_JAVA_HOME`
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JDK 12 and testing on a JDK 8 runtime; to do this, set `RUNTIME_JAVA_HOME`
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pointing to the Java home of a JDK 8 installation. Note that this mechanism can
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be used to test against other JDKs as well, this is not only limited to JDK 8.
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