[7.x] Backport JDK Unit Testing Matrices (#11839)

* Defined the versions of JDK to use in test build separated by OS (#11768)

* Added JDK 11 and 14 to Unix testing matrix (#11801)

- OpenJDK14 AdoptOpenJDK11 Zulu11
- OpenJDK14 AdoptOpenJDK14 Zulu14

Close #11801

Co-authored-by: Andrea Selva <andrea.selva@elastic.co>

.ci/matrix-unix-runtime-javas.yml

@@ -0,0 +1,18 @@
+# This file is used as part of a matrix build in Jenkins where the
+# values below are included as an axis of the matrix.
+
+# This axis of the build matrix represents the versions of Java on
+# which Elasticsearch will be tested.  Valid Java versions are 'java'
+# or 'openjdk' followed by the major release number.
+
+LS_RUNTIME_JAVA:
+#  - java8
+#  - zulu8
+#  - adoptopenjdk8
+#  - java11
+  - openjdk11
+  - adoptopenjdk11
+  - zulu11
+  - openjdk14
+  - adoptopenjdk14
+  - zulu14

.ci/matrix-windows-runtime-javas.yml

@@ -0,0 +1,12 @@
+# This file is used as part of a matrix build in Jenkins where the
+# values below are included as an axis of the matrix.
+
+# This axis of the build matrix represents the versions of Java on
+# which Elasticsearch will be tested.  Valid Java versions are 'java'
+# or 'openjdk' followed by the major release number.
+
+LS_RUNTIME_JAVA:
+#  - zulu8
+#  - adoptopenjdk8
+  - zulu11
+#  - adoptopenjdk11

ci/unit_tests.bat

@@ -40,6 +40,9 @@ echo Using drive !use_drive! for %WORKSPACE%
 !use_drive!
 
 echo Running core tests..
+if "%BUILD_JAVA_HOME%" == "" (
+  GRADLE_OPTS="%GRADLE_OPTS% -Dorg.gradle.java.home=%BUILD_JAVA_HOME%"
+)
 call .\gradlew.bat test --console=plain --no-daemon --info
 
 if errorlevel 1 (