sysutils/logstash94: Fix runtime: restrict JAVA_VERSION for 21 only
Logstash 9.4 supports Java 21 only.
1) Logstash 9.4 doesn't support Java 17:
https://www.elastic.co/docs/release-notes/logstash#logstash-9.4.0-release-notes
"Logstash now also requires Java 21 or later, and Java 17 is no longer supported."
2) Logstash 9.4 in the port (precompiled) doesn't support Java 25.
There's an error after start:
===
[2026-08-14T09:38:23,211][FATAL][org.logstash.Logstash ][main] uncaught error (in thread Ruby-0-Thread-11: /usr/local/logstash/logstash-core/lib/logstash/java_pipeline.rb:335)
java.lang.NoSuchMethodError: 'java.util.Queue com.sun.tools.javac.util.Log$DeferredDiagnosticHandler.getDiagnostics()'
at com.google.googlejavaformat.java.JavaInput.buildToks(com/google/googlejavaformat/java/JavaInput.java:367)
at com.google.googlejavaformat.java.JavaInput.buildToks(com/google/googlejavaformat/java/JavaInput.java:335)
at com.google.googlejavaformat.java.JavaInput.<init>(com/google/googlejavaformat/java/JavaInput.java:277)
at com.google.googlejavaformat.java.Formatter.getFormatReplacements(com/google/googlejavaformat/java/Formatter.java:270)
at com.google.googlejavaformat.java.Formatter.formatSource(com/google/googlejavaformat/java/Formatter.java:257)
at com.google.googlejavaformat.java.Formatter.formatSource(com/google/googlejavaformat/java/Formatter.java:223)
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sysutils/logstash94: Fix runtime: restrict JAVA_VERSION for 21 only
Logstash 9.4 supports Java 21 only.
1) Logstash 9.4 doesn't support Java 17:
https://www.elastic.co/docs/release-notes/logstash#logstash-9.4.0-release-notes
"Logstash now also requires Java 21 or later, and Java 17 is no longer supported."
2) Logstash 9.4 in the port (precompiled) doesn't support Java 25.
There's an error after start:
===
[2026-08-14T09:38:23,211][FATAL][org.logstash.Logstash ][main] uncaught error (in thread Ruby-0-Thread-11: /usr/local/logstash/logstash-core/lib/logstash/java_pipeline.rb:335)
java.lang.NoSuchMethodError: 'java.util.Queue com.sun.tools.javac.util.Log$DeferredDiagnosticHandler.getDiagnostics()'
at com.google.googlejavaformat.java.JavaInput.buildToks(com/google/googlejavaformat/java/JavaInput.java:367)
at com.google.googlejavaformat.java.JavaInput.buildToks(com/google/googlejavaformat/java/JavaInput.java:335)
at com.google.googlejavaformat.java.JavaInput.<init>(com/google/googlejavaformat/java/JavaInput.java:277)
at com.google.googlejavaformat.java.Formatter.getFormatReplacements(com/google/googlejavaformat/java/Formatter.java:270)
at com.google.googlejavaformat.java.Formatter.formatSource(com/google/googlejavaformat/java/Formatter.java:257)
at com.google.googlejavaformat.java.Formatter.formatSource(com/google/googlejavaformat/java/Formatter.java:223)
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