not able to create primary index using python sdk 3.0.5 cb 6.0.3-2895

File "/Users/manasaghanta/Documents/mobile-test/DailyCode-changes/mobile-testkit/venv/lib/python3.6/site-packages/couchbase/exceptions.py", line 1411, in wrapped
return func(*args, **kwargs)
File "/Users/manasaghanta/Documents/mobile-test/DailyCode-changes/mobile-testkit/venv/lib/python3.6/site-packages/couchbase/management/queries.py", line 186, in create_primary_index
self._create_index(bucket_name, fields, index_name, *options, **kwargs)
File "/Users/manasaghanta/Documents/mobile-test/DailyCode-changes/mobile-testkit/venv/lib/python3.6/site-packages/couchbase/management/queries.py", line 156, in _create_index
self._n1ql_index_create(bucket_name, index_name, fields=fields, **final_args)
File "/Users/manasaghanta/Documents/mobile-test/DailyCode-changes/mobile-testkit/venv/lib/python3.6/site-packages/couchbase/management/queries.py", line 125, in _n1ql_index_create
return IxmgmtRequest(self._admin_bucket, 'create', info, **options).execute()
File "/Users/manasaghanta/Documents/mobile-test/DailyCode-changes/mobile-testkit/venv/lib/python3.6/site-packages/couchbase_core/_ixmgmt.py", line 160, in execute
return [x for x in self]
File "/Users/manasaghanta/Documents/mobile-test/DailyCode-changes/mobile-testkit/venv/lib/python3.6/site-packages/couchbase_core/_ixmgmt.py", line 160, in <listcomp>
return [x for x in self]
File "/Users/manasaghanta/Documents/mobile-test/DailyCode-changes/mobile-testkit/venv/lib/python3.6/site-packages/couchbase_core/ixmgmt.py", line 144, in __iter_
self._start()
File "/Users/manasaghanta/Documents/mobile-test/DailyCode-changes/mobile-testkit/venv/lib/python3.6/site-packages/couchbase_core/_ixmgmt.py", line 132, in _start
self._cmd, index_to_rawjson(self._index), **self._options)
couchbase.exceptions.NotSupportedException: <RC=0xD6[LCB_ERR_UNSUPPORTED_OPERATION (214)], Couldn't schedule ixmgmt operation, C Source=(src/ixmgmt.c,106)>