How to set expand_all_set_operators=False

[Victor Duraes De Faria]

I got the following warning in Pyomo:

Reading data files.WARNING: Extracting subsets for Set tech_all, which is a SetOperator other
    than a SetProduct.  Returning this set and not descending into the set
    operands.  To descend into this operator, specify
    'subsets(expand_all_set_operators=True)' or to suppress this warning,
    specify 'subsets(expand_all_set_operators=False)'

I imagine it is because I am using:

    M.tech_resource = Set()
    M.tech_production = Set()
    M.tech_all = M.tech_resource | M.tech_production  

and

M.CapacityToActivity = Param(M.RegionalIndices, M.tech_all, default=1)

How do I set subsets(expand_all_set_operators=False)?