fix: use a separate jvm

Author: salvatore-campagna

benchmarks/src/main/java/org/elasticsearch/benchmark/search/query/range/DateFieldMapperDocValuesSkipperBenchmark.java

@@ -102,7 +102,7 @@
 @BenchmarkMode(Mode.SampleTime)
 @OutputTimeUnit(TimeUnit.MILLISECONDS)
 @State(Scope.Thread)
-@Fork(0)
+@Fork(1)
 @Warmup(iterations = 10)
 @Measurement(iterations = 10)
 public class DateFieldMapperDocValuesSkipperBenchmark {