fix: env based _JAVA_OPTIONS for opensearch container (#2082)

* fix: env based _JAVA_OPTIONS for opensearch container

docker-compose.opensearch.base.yml

@@ -4,7 +4,7 @@ services:
     environment:
       - "cluster.name=opensearch-cluster"
       - "bootstrap.memory_lock=true" # along with the memlock settings below, disables swapping
-      - "_JAVA_OPTIONS=-XX:UseSVE=0" # disables SVE (Scalable Vector Extension) for ARM64
+      - "_JAVA_OPTIONS=${JAVA_OPTIONS:-}" # Load _JAVA_OPTIONS from env, fallback to empty string
       - "OPENSEARCH_JAVA_OPTS=-Xms1024m -Xmx1024m" # Set min and max JVM heap sizes to at least 50% of system RAM
       - "DISABLE_INSTALL_DEMO_CONFIG=true" # disables execution of install_demo_configuration.sh bundled with security plugin, which installs demo certificates and security configurations to OpenSearch
       - "DISABLE_SECURITY_PLUGIN=true" # disables security plugin entirely in OpenSearch by setting plugins.security.disabled: true in opensearch.yml

env/backend.local.example.env

@@ -43,3 +43,7 @@ SOCIAL_AUTH_OL_OIDC_KEY=apisix
 # This is not a secret. This is for the Keycloak container, only for local use.
 SOCIAL_AUTH_OL_OIDC_SECRET=HckCZXToXfaetbBx0Fo3xbjnC468oMi4 # pragma: allowlist-secret
 USERINFO_URL=http://kc.ol.local:8066/realms/ol-local/protocol/openid-connect/userinfo
+
+# _JAVA_OPTIONS for Opensearch container are not consistent between different CPU architectures e.g ARM and x86.
+# Here, anyone can set options like -XX:UseSVE=0 based on their CPU.
+JAVA_OPTIONS=