While migration from ElasticSearch 5 to 7.6.1 I had to take an extra step and first migrate to ElasticSearch 6.8.
When I tried to run the 6.8 version, it failed with the following error message:
2020-03-30 10:18:32 Commons Daemon procrun stderr initialized
OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
Exception in thread "main" java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "accessClassInPackage.jdk.internal.vm.annotation")
at java.base/java.security.AccessControlContext.checkPermission(AccessControlContext.java:472)
at java.base/java.security.AccessController.checkPermission(AccessController.java:1036)
at java.base/java.lang.SecurityManager.checkPermission(SecurityManager.java:408)
at java.base/java.lang.SecurityManager.checkPackageAccess(SecurityManager.java:1324)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:174)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:416)
at java.base/sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
at java.base/sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
at java.base/sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
at java.base/sun.reflect.annotation.AnnotationParser.parseSig(AnnotationParser.java:440)
at java.base/sun.reflect.annotation.AnnotationParser.parseAnnotation2(AnnotationParser.java:242)
at java.base/sun.reflect.annotation.AnnotationParser.parseAnnotations2(AnnotationParser.java:121)
at java.base/sun.reflect.annotation.AnnotationParser.parseAnnotations(AnnotationParser.java:73)
at java.base/java.lang.reflect.Executable.declaredAnnotations(Executable.java:614)
at java.base/java.lang.reflect.Executable.declaredAnnotations(Executable.java:612)
at java.base/java.lang.reflect.Executable.getAnnotation(Executable.java:582)
at java.base/java.lang.reflect.Method.getAnnotation(Method.java:696)
at <<<guice>>>
at org.elasticsearch.repositories.RepositoriesModule.lambda$configure$1(RepositoriesModule.java:68)
at java.base/java.util.HashMap.forEach(HashMap.java:1338)
at java.base/java.util.Collections$UnmodifiableMap.forEach(Collections.java:1505)
at org.elasticsearch.repositories.RepositoriesModule.configure(RepositoriesModule.java:68)
at <<<guice>>>
at org.elasticsearch.node.Node.<init>(Node.java:492)
at org.elasticsearch.node.Node.<init>(Node.java:245)
at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:212)
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:212)
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:322)
<<<truncated>>>
The problem was that I already installed the latest JAVA OpenJRE. This version is not compatible with ElasticSearch 6.8.
To fix it I had to downgrade to Java 12.