Fix java.library.path in VectorScorerBenchmark about elasticsearch HOT 2 OPEN

// build localDistro as a convenience to get a local JDK and build the native libs, e.g.
./gradlew localDistro
export RUNTIME_JAVA_HOME=/home/ubuntu/git/elasticsearch/build/distribution/local/elasticsearch-8.14.0-SNAPSHOT/jdk/

// enable logging, e.g.
$ git diff benchmarks/src/main/resources/log4j2.properties
@@ -4,5 +4,5 @@ appender.console.layout.type = PatternLayout
 appender.console.layout.pattern = [%d{ISO8601}][%-5p][%-25c] [%node_name]%marker %m%n
 
 # Do not log at all if it is not really critical - we're in a benchmark
-rootLogger.level = error
+rootLogger.level = debug
 rootLogger.appenderRef.console.ref = console

// run the benchmark
./gradlew -p benchmarks run --args "org.elasticsearch.benchmark.vector.VectorScorerBenchmark -p dims=1024"
...
[2024-05-07T14:04:49,404][WARN ][org.elasticsearch.nativeaccess.NativeAccess] [
ode_name] Unable to load native provider. Native methods will be disabled.
java.lang.UnsatisfiedLinkError: Could not find libsystemd.so.0 in java.library.path: /home/ubuntu/git/elasticsearch/libs/native/libraries/build/platform/linux-aarch64
        at org.elasticsearch.nativeaccess.jdk.JdkSystemdLibrary.findLibSystemd(JdkSystemdLibrary.java:53) ~[elasticsearch-native-8.14.0-SNAPSHOT.jar:8.14.0-SNAPSHOT]
        at org.elasticsearch.nativeaccess.jdk.JdkSystemdLibrary.<clinit>(JdkSystemdLibrary.java:29) ~[elasticsearch-native-8.14.0-SNAPSHOT.jar:8.14.0-SNAPSHOT]
...