Arango AQL use index to search for existing property

Question

I want to get all object with available property "available"

For u in col
filter u.available!= null
return u

But the above query would not use index even if u.available is indexed. How can I iterate with the use of index?

Answer 1

With comment from @mpoeter, I can create an index that are specifically spare to force arango to use index.