Unified Auditing Oracle 12c

Hi,

I am testing unified auditing in 12c and have a simple question hopefully.  I created the following policy

CREATE AUDIT POLICY QUBE_INDEX_AUDIT

ACTIONS CREATE INDEX, DROP INDEX, ALTER INDEX;

AUDIT POLICY QUBE_INDEX_AUDIT;

I then ran:

create index testi1 on test (SKYC_DATE_VAL_FLAG);

AND Also

drop index testi1 on test (SKYC_DATE_VAL_FLAG);

On running the following query I noticed the drop command is not audited

ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS';

select dbusername,event_timestamp,sql_text,CLIENT_PROGRAM_NAME,OBJECT_SCHEMA,OBJECT_NAME,ACTION_NAME,OS_USERNAME,TERMINAL,AUDIT_TYPE,UNIFIED_AUDIT_POLICIES