add ml model group system index (opensearch-project#2790)

Signed-off-by: Yaliang Wu <ylwu@amazon.com>

tools/install_demo_configuration.sh

@@ -383,7 +383,7 @@ echo "plugins.security.enable_snapshot_restore_privilege: true" | $SUDO_CMD tee
 echo "plugins.security.check_snapshot_restore_write_privileges: true" | $SUDO_CMD tee -a "$OPENSEARCH_CONF_FILE" > /dev/null
 echo 'plugins.security.restapi.roles_enabled: ["all_access", "security_rest_api_access"]' | $SUDO_CMD tee -a "$OPENSEARCH_CONF_FILE" > /dev/null
 echo 'plugins.security.system_indices.enabled: true' | $SUDO_CMD tee -a "$OPENSEARCH_CONF_FILE" > /dev/null
-echo 'plugins.security.system_indices.indices: [".plugins-ml-model", ".plugins-ml-task", ".opendistro-alerting-config", ".opendistro-alerting-alert*", ".opendistro-anomaly-results*", ".opendistro-anomaly-detector*", ".opendistro-anomaly-checkpoints", ".opendistro-anomaly-detection-state", ".opendistro-reports-*", ".opensearch-notifications-*", ".opensearch-notebooks", ".opensearch-observability", ".ql-datasources", ".opendistro-asynchronous-search-response*", ".replication-metadata-store", ".opensearch-knn-models"]' | $SUDO_CMD tee -a "$OPENSEARCH_CONF_FILE" > /dev/null
+echo 'plugins.security.system_indices.indices: [".plugins-ml-model-group", ".plugins-ml-model", ".plugins-ml-task", ".opendistro-alerting-config", ".opendistro-alerting-alert*", ".opendistro-anomaly-results*", ".opendistro-anomaly-detector*", ".opendistro-anomaly-checkpoints", ".opendistro-anomaly-detection-state", ".opendistro-reports-*", ".opensearch-notifications-*", ".opensearch-notebooks", ".opensearch-observability", ".ql-datasources", ".opendistro-asynchronous-search-response*", ".replication-metadata-store", ".opensearch-knn-models"]' | $SUDO_CMD tee -a "$OPENSEARCH_CONF_FILE" > /dev/null
 
 #network.host
 if $SUDO_CMD grep --quiet -i "^network.host" "$OPENSEARCH_CONF_FILE"; then