Update and delete queries not picking up array indexes

Version: 5.1.0-1511 

test: tuqquery/tuq_2i_index.py test_array_index_delete 

Run the test conf: python testrunner.py -i /Users/korrigan.clark/Desktop/resources/vagrant-2.ini -c conf/tuq/py-tuq-arrayindexing.conf -p doc-per-day=6,primary_indx_type=GSI,array_indexing=True 

The test has two indexes: primary and arraydel_idx 

CREATE INDEX array_delidx ON default( DISTINCT ARRAY v FOR v in join_yr END) USING gsi 

Then run: 
EXPLAIN delete from default where any v in join_yr SATISFIES v=2012 end LIMIT 1 

This will show PrimaryScan when DistinctScan is expected. 

You can run: 

EXPLAIN select * from default where any v in join_yr SATISFIES v=2012 end LIMIT 1 

and you will see that DistinctScan is occuring