Java changes + logs

Author: ldematte

libs/native/src/main/java/org/elasticsearch/nativeaccess/jdk/JdkVectorLibrary.java

@@ -41,7 +41,7 @@ public final class JdkVectorLibrary implements VectorLibrary {
         try {
             int caps = (int) vecCaps$mh.invokeExact();
             logger.info("vec_caps=" + caps);
-            if (caps != 0) {
+            if (caps > 0) {
                 if (caps == 2) {
                     dot7u$mh = downcallHandle(
                         "dot7u_2",
@@ -67,6 +67,12 @@ public final class JdkVectorLibrary implements VectorLibrary {
                 }
                 INSTANCE = new JdkVectorSimilarityFunctions();
             } else {
+                if (caps < 0) {
+                    logger.warn("""
+                        Your CPU supports vector capabilities, but they are disabled at OS level. For optimal performance, enable them in \
+                        your OS/Hypervisor/VM/container
+                        """);
+                }
                 dot7u$mh = null;
                 sqr7u$mh = null;
                 INSTANCE = null;

libs/simdvec/native/build.gradle

@@ -11,7 +11,7 @@ apply plugin: 'cpp'
 
 var os = org.gradle.internal.os.OperatingSystem.current()
 
-// To update this library run publish_vec_binaries.sh  ( or ./gradlew vecSharedLibrary )
+// To update this library run publish_vec_binaries.sh  ( or ./gradlew buildSharedLibrary )
 // Or
 // For local development, build the docker image with:
 //   docker build --platform linux/arm64 --progress=plain --file=Dockerfile.aarch64 . (for aarch64)