Add note about enabling Panama for vector collections (#1177)

Co-authored-by: Oliver Howell <[email protected]>

docs/modules/data-structures/pages/vector-collections.adoc

@@ -14,6 +14,19 @@ Conceptually, a vector collection resembles a key-value store. Here, the key is
 
 Users can store any value they require as metadata. This could be additional characteristics of the source data or even the source data itself.
 
+== JVM configuration
+
+Vector collection indexing and search are computationally very intensive and can utilize SIMD instructions.
+For best performance using vector collections, use Java 21 and enable Vector API from Project Panama by adding `--add-modules jdk.incubator.vector` to xref:configuration:jvm-parameters.adoc[JVM parameters].
+
+If you use Docker, you can use the following example command:
+
+```sh
+docker run -p 5701:5701 -e HZ_LICENSEKEY=<your_license_key> \
+       -e "JAVA_OPTS=--add-modules jdk.incubator.vector -Dhazelcast.partition.count=16" \
+       hazelcast/hazelcast-enterprise:latest-snapshot-slim-jdk21
+```
+
 == Configuration
 Collection configuration can be set dynamically during vector collection creation or statically during cluster configuration. Unlike other data structures, the configuration must be set up before the collection can be used.
 There is no default configuration for the vector collection. If no matching configuration is found for the specified vector collection, the system raises an error.